He listened thoughtfully, interjecting only the odd word.

他细心地聆听，只插了几句话。

Commit yourself to hearing other people out completely before interjecting your own point of view.

在你提出自己的观点之前，先要保证仔细完整地听别人把话说完。

You can sometimes throw your opponent out of his stride by interjecting a confident, concise cliche. Here are some good ones.

有时候你可以插些话自信的简练的套话来打断对手的节奏。