Lactein

[醫] 煉乳, 乳酸菌素

??? 情景例句

What guarantee do I have that it won't break down easily?
有什么保障它不會輕易出故障?
Constant dropping wears away a stone.
滴水穿石。
The two boys are in the river now.
兩個男孩現在在河里。
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