STEM与日常科技·英语30篇（7）

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净水器如何去除微塑料

Microplastics—tiny plastic fragments under 5 mm—are increasingly found in tap and bottled water worldwide.
Activated carbon filters trap some particles through adsorption, but their effectiveness depends on pore size and contact time.
Ceramic filters with sub-micron pores physically block particles larger than 0.2–0.5 micrometers reliably.
Reverse osmosis systems force water through semi-permeable membranes that reject over 99% of microplastics and dissolved salts.
Newer nanofiber membranes offer higher flow rates while maintaining filtration down to 0.1 micrometers.
Testing confirms RO units remove nearly all microplastics, whereas pitcher filters vary widely by brand and age.
Filters must be replaced regularly; clogged or worn media lose efficiency and may even release trapped particles.
Independent labs now test consumer filters for microplastic removal, helping buyers compare real-world performance.
Combining multiple stages—sediment + carbon + membrane—provides layered defense against diverse contaminants.
This convergence of materials science, fluid dynamics, and environmental health makes modern filtration essential.

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

Combining multiple stages—sediment + carbon + membrane—provides layered defense against diverse contaminants. 多级组合过滤（如沉淀+活性炭+膜）可针对多种污染物构建多重防护。
Ceramic filters with sub-micron pores physically block particles larger than 0.2–0.5 micrometers reliably. 亚微米级孔径的陶瓷滤芯能可靠阻隔大于0.2–0.5微米的颗粒。
Microplastics—tiny plastic fragments under 5 mm—are increasingly found in tap and bottled water worldwide. 微塑料——直径小于5毫米的微小塑料碎片——正越来越多地在全球各地的自来水和瓶装水中被检出。

这篇中文题目最接近哪一句？净水器如何去除微塑料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？微塑料——直径小于5毫米的微小塑料碎片——正越来越多地在全球各地的自来水和瓶装水中被检出。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 Water Filters Remove Microplastics How to cook noodles A maths worksheet

Combining multiple stages—sediment + carbon + membrane—provides layered defense against diverse contaminants.

Combining multiple stages—sediment + carbon + membrane—provides layered defense against diverse contaminants.

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：Combining multiple stages—sediment + carbon + membrane—provides layered defense against diverse contaminants.