单次英文

你好，单次就是一次的意思，首次就是第一次，这两种是两个完全不同的概念

单次。就是一次性的意思。只能用一次，下次不要用。

The boy didin`t do his homework but did something (else). Is (it) your turn to do it? How (much) do you usually get (from) your red envelope ? Danny and Jenny are sitting (--) outside.

also al.so[`ɒlso; ˋɒ:lsou]副词(无比较级、最高级)也,亦,同样地,并且,又,另外He ~ speaks English. = He speaks English(,) ~.他还会说英文She has two dogs and ~ three cats.她有两只狗另外还有三只猫not only ? but also→ not连接词(口语)而且,也,亦,又 (and also)