知己；心腹；左右手

n.心腹，左右手

second sex───第二性

second selves───知己；心腹；左右手

second sexes───第二性

second sheet───信笺的副页；（供复写用的）拷贝纸

second best───居第二位的；仅次于最好的

second gear───第二档

second men───n.火车司机的助手

friend is, as it were, a second self.───朋友就好像第二个自己。

Death second self that seals up all in rest.───上帝之死的影子漫漫将一切祈望藏匿并安息远去.

As after sunset death in the west; Which by and by black night doth take away, Death's second self, that seals all up in rest.───它在日落后向西方徐徐消退：黑夜，死的化身，渐渐把它赶开，严静的安息笼住纷纭的万类。

You my friend is , as it were, a second self.───你，我的朋友，就是另一个自我。

Death's second self, that seals up all in rest.───挤走黄昏，把一切封进了安息。

The second, Self-adapting rule system.───第二，研究开发规则调整系统。

One of Zeno's sayings is: A friend is a second self.───芝诺有一句名言是：朋友如同第二个自我。

Kiaochow Bay subsea tunnel is the second self-building tunnel in China with the designed service life over 100 years.───胶州湾海底隧道是中国自行建造的第二条海底隧道，其服役寿命为100a。

A friend is, as it were, a second self. ---- Marcus Tullius Cicero.