科学素养与生活应用·英语30篇（5）

25 / 30

已读 0 / 30 课

自修复混凝土如何利用内置细菌修补微裂缝

Self-healing concrete contains dormant bacteria and calcium lactate embedded in its matrix.
When water enters a crack, the bacteria activate and metabolize the lactate to produce limestone.
This newly formed calcium carbonate fills the gap naturally over several days.
Unlike traditional repairs, this process requires no human intervention or external materials.
Engineers use this technology to extend bridge and tunnel lifespans by up to 25 years.
The bacteria remain viable for decades as long as they stay dry and sealed.
Researchers select alkaliphilic strains that thrive in concrete’s high-pH environment.
Field tests show 90% crack closure in laboratory-simulated rain exposure cycles.
This innovation reduces maintenance costs and lowers carbon emissions from repeated renovations.
It exemplifies how microbiology and civil engineering converge to solve infrastructure challenges.

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

Researchers select alkaliphilic strains that thrive in concrete’s high-pH environment. 研究人员选用嗜碱菌株，使其适应混凝土的高碱性环境。
Field tests show 90% crack closure in laboratory-simulated rain exposure cycles. 实地测试显示，在实验室模拟的雨水循环中，裂缝闭合率达90%。
Self-healing concrete contains dormant bacteria and calcium lactate embedded in its matrix. 自修复混凝土内部含有处于休眠状态的细菌和乳酸钙。

这篇中文题目最接近哪一句？自修复混凝土如何利用内置细菌修补微裂缝一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？自修复混凝土内部含有处于休眠状态的细菌和乳酸钙。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） How Self-Healing Concrete Repairs Microcracks Using Embedded Bacteria How to cook noodles A maths worksheet

Researchers select alkaliphilic strains that thrive in concrete’s high-pH environment.

Researchers select alkaliphilic strains that thrive in concrete’s high-pH environment.

第一版：录下来、回听、再听标准音。系统打分以后再加。

用今天的表达，自己说一句。

例子：Researchers select alkaliphilic strains that thrive in concrete’s high-pH environment.