Alternando
更比定理
🗣️ 情景例句
It's getting late.
时间不早了。
He has the advantage of a new set of clubs and has played everyday.
他拥有新的球杆，所以有利，何况他每天都在练习。
and should not be put in drinks unless it is known to be safe.
只有知道冰块安全时才能加入饮料。