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1·He hit him with two sharp lefts.

他给了他两记猛烈的左手拳。《牛津词典》

2·He lefts his homework at home.

他把作业忘家里了。

3·Who suffers the most, the one lefts, or the one stays?

离开的和留下的到底哪一方最痛苦？

4·Then two lefts, two rights. And then swim into the wall, no matter how many it is.

然后左手二次，右手二次，其余全是配合游，能游多少就游多少。

5·Being in this wide desert, almost no trace of mankind can be found in the sky, even though accidentally an airplane passes by swiftly and lefts a long white belt, they will be disappeared in a minute.

在广袤无垠的大漠里，天空看不到丁点儿人类留下的痕迹。即便偶尔有飞机掠过，撒下一条长长的白，瞬间也会消逝不见。