英语语法分析

On various pretexts, they all moved off, and Alice was soon left alone.

它们都以各种借口离开了，很快就只剩下爱丽丝一个人了。

He procrastinated his return on various pretexts.

他以各种借口拖延归期。

I don't know the real reason below the mass of pretexts.

我不知道在一大堆借口掩饰之下的真正原因。