Lactase

n. 乳糖酶\\n[化] 乳糖酶

??? 情景例句

I would lke to place an order please.
我要下定單。
There's many a good tune played on an old fiddle.
老當益壯。
of a change of atmosphere, of a diversion of effort, is essential.
改變一下氣氛,轉移一下注意力,這是不可缺少的。
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