城市汽车小队 · 4–8 岁

搅拌车的肚子为什么一直转

绕个弯，也要稳稳送到

科普启蒙约 12 分钟4-8 岁中英双语

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清早，一辆圆肚子的搅拌车经过参观区。呼噜噜，肚子还在转！安安问妈妈：“它一边走，一边在做大蛋糕吗？”

Early in the morning, a round-bellied mixer truck passed the visitor area. Whirr—its drum was turning! “Is it baking a giant cake as it goes?” An'an asked Mom.

清早，一辆圆肚子的搅拌车经过参观区。呼噜噜，肚子还在转！安安问妈妈：“它一边走，一边在做大蛋糕吗？”

Early in the morning, a round-bellied mixer truck passed the visitor area. Whirr—its drum was turning! “Is it baking a giant cake as it goes?” An'an asked Mom.

林工程师笑着说：“它送的是混凝土，今天要浇筑小桥旁的平台。”安安指着滚筒：“原来里面装的不是面糊呀！”

“It is carrying concrete for a platform beside the little bridge,” Lin smiled. An'an pointed at the drum. “So it isn't cake batter!”

混凝土和水泥不是同一种东西。水泥像配方里的一个成员，还要按要求配上水、沙子和石子等材料，才能做成需要的混凝土。

Concrete and cement are not the same thing. Cement is one ingredient, combined with water, sand, stone and other materials in a specified mix to make concrete.

在搅拌站，材料按配方计量，再搅拌均匀。不是随便多加一桶水，就能变得更好用。安安点头：“做东西也要守配方。”

At the mixing plant, ingredients were measured and mixed according to the recipe. Adding extra water at random would not improve it. “A recipe matters,” An'an nodded.

装好后，大滚筒继续慢慢转。里面的叶片带着混凝土翻动，帮助它保持均匀，减少材料分开沉下去。呼噜噜，是出发前的准备声。

After loading, the drum kept turning slowly. Blades inside moved the concrete to help keep it uniform and reduce separation. Whirr—it was ready to leave.

妈妈说：“一直转，也不能让混凝土永远不硬。工作人员还要管理时间、温度和材料状态。”安安说：“它是有时间安排的快递！”

“Turning cannot stop concrete from hardening forever,” Mom said. “The team must manage time, temperature and its condition.” “A delivery with a schedule!” An'an replied.

司机出发前确认路线，工地也准备好了接货的人和设备。搅拌车不是到哪里随便倒，而是去约定的地方。

The driver confirmed the route, and the site prepared people and equipment to receive the load. The truck would not pour just anywhere: it had an agreed destination.

半路上，一段道路临时封闭。搅拌车停在允许等待的位置，司机联系调度。安安从人行道远远看见：“大肚子遇到绕路啦！”

A road was temporarily closed. The truck stopped where waiting was allowed, and the driver contacted dispatch. Watching from the sidewalk, An'an said, “The big belly needs a detour!”

调度重新安排路线，也把消息告诉工地。大家一起判断这车混凝土能否按要求使用。着急不能代替检查，更不能闯红灯。

Dispatch arranged a new route and informed the site. Together they assessed whether the concrete could still meet requirements. Hurrying could not replace checks—or justify running red lights.

车到了，工作人员检查这批混凝土的资料和状态。确认符合要求，才安排卸料。安安松口气：“不是赶到就算完成，还要检查好。”

At the site, workers checked the batch information and condition. Only after confirming it met requirements did unloading begin. “Arriving isn't enough; it must be checked,” An'an said.

司机让滚筒按卸料需要改变转动方向，里面的叶片把混凝土送向出口。后面的溜槽已经对好位置，工作人员站在安全处配合。

The driver changed the drum's direction for unloading. Its blades moved concrete toward the outlet. The rear chute was aligned, and workers assisted from safe positions.

哗——湿湿的混凝土沿溜槽流下去。林工程师说：“不能用手摸，更不能赤脚踩。施工人员要穿戴好防护用品。”

Whoosh—wet concrete flowed down the chute. “Do not touch it or step in barefoot,” Lin said. “Workers must wear proper protection.”

平台的形状靠模板围好，钢筋按设计布置。搅拌车负责送材料，后面还有浇筑、振实和表面处理等工作。

Forms defined the platform, and reinforcement followed the design. The mixer delivered material; placing, consolidating and finishing still remained.

平台浇好了，也不能马上踩上去。工作人员养护、保护它，等达到要求再开放。安安问：“原来变结实，还需要耐心呀？”

Even after pouring, the platform could not be walked on immediately. Workers cured and protected it until it met requirements. “Getting strong takes patience, too?” An'an asked.

搅拌车去指定清洗区洗好设备，废水也集中处理。它没有把剩料倒进小河。安安看着河边的树：“公园和河水都要照顾。”

The mixer went to a designated washout area, where wastewater was collected. It did not dump leftovers in the stream. “We must care for both the park and the river,” An'an said.

回家后，妈妈拿出密封的小瓶，里面装着水和干净小石子。安安轻轻转一转，再放稳观察：“混在一起和沉下来，样子不一样！”

At home, Mom brought a sealed bottle of water and clean pebbles. An'an gently rolled it, then watched it settle. “Mixed and settled look different!”

猜一猜：滚筒转动，是让材料均匀些，还是保证它永远不会硬？安安把玩具车推过去：“还要看时间和检查结果呢！”

Does turning help the mix stay uniform, or guarantee it never hardens? An'an rolled her toy truck. “Timing and checks matter, too!”

平台开放了，安安和妈妈站在上面看小桥。她想起那段绕路：“大肚子送来的，不只是材料，还有大家商量好的每一步。”

When the platform opened, An'an and Mom stood on it to admire the bridge. She remembered the detour. “The big belly brought materials—and a plan everyone worked on together.”

材料要合适，时间要安排，遇到变化及时沟通。

Use suitable materials, plan the timing and communicate when plans change.

给大人的共读锦囊

这次不考背诵，练一种生活能力

这本想陪孩子练什么

理解材料、时间和沟通共同影响结果。

共读时别急着说

不把搅拌车讲成转着就永远不会硬的魔法车。

可以这样问

混凝土和水泥是一回事吗？
绕路后为什么要联系工地并再次检查？

今天试试看

成人封好装有水与干净小石子的透明瓶，轻转再静置看变化；这不是混凝土实验。

4–5 岁：每次听几个动作就好，允许配音、指图和重复最喜欢的一页。

6–8 岁：请孩子解释一次遇到困难后的选择，比较两种车的分工，不要求背术语。

绘本视频

将当前插图、字幕和旁白合成为适合手机分享的竖屏视频。

这本想陪孩子练什么

共读时别急着说

可以这样问

今天试试看

绘本视频

分享绘本