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。