1.second best 第二好的，仅次于最好的
She refuses to settle for second best - she strives for perfection.
她不甘第二，努力做到最好。
2.second to none 与其他一样好的；比其他好的
The conditions that these prisoners are kept in are second to none.
这些犯人的关押环境是最好的。
3.second cousin 父母的堂（或表）兄弟姐妹的子女
The two were also second cousins on their fathers' side.
这两人也是他们父亲的表兄妹。
4.second nature 第二天性；习性
I used to hate computers, but using them is second nature to me now.
我曾经讨厌电脑，但现在使用电脑成为了我的习惯。
5.second thought 重新考虑；改变主意；开始怀疑；转念一想
Can I have a cup of coffee, please? - actually, on second thoughts, I'll have a beer.
请来杯咖啡——说实话，我改主意了，来杯啤酒好了。
6.second wind 恢复的力量（或精力）
We started to feel we couldn't walk any further but when we saw the town in the distance we got our second wind.
我们开始感到累得走不动了，但看到远处的村庄时，我们又有了前进的力量。
7.second-guess 猜测；预言/事后批评
She's always trying to second-guess the boss.
她老是试图揣测老板的意图。
