Allying self with a sibling.

自结盟与兄弟姐妹。

Allying with an opponent during a match is unusual and is not allowed.

比赛中与对手结盟是不被允许的异常行为。

But in a speech to the upper house, Mr Berlusconi warned them that allying themselves with the left would plunge the country into dark times.

但在上院的演讲中，贝卢斯科尼警告他们如果与左派联合将使国家陷入黑暗。