当孩子小的时候，尤其是三岁以下的儿童，耳咽管非常短，不能有效地将微生物阻隔在外面。

When you were young, especially before you turned 3, the eustachian tubes were very small and less able to keep germs out.

youdao

除了完全可生物降解的，它们的阻隔性能也表现出相似，展出的乙烯乙烯醇(见第3.1.2)。

Besides being completely biodegradable, they also exhibit barrier properties similar to those exhibited by ethylene vinyl alcohol (see Section 3.1.2).

youdao

除了完全可生物降解的，它们的阻隔性能也表现出相似，展出的乙烯乙烯醇(见第3.1.2)。

Besides being completely biodegradable, they also exhibit barrier properties similar to those exhibited by ethylene vinyl alcohol (see Section 3.1.2).

youdao