What points can be raised in defence of this argument?

有什么论点能提出来为这个说法辩护呢？

The leader's speech in defence of the policy didn't carry much conviction.

那位领导人为政策辩护的讲话不是很有说服力。

We should pay tribute to soldiers died in defence of our country.

我们应该向保卫祖国而牺牲了的军人表示敬意。

He gave his life in defence of his country.

他在保卫祖国的时候付出了生命。

He spoke in defence of a disciplined approach.

他为遵守纪律的做法作辩护。