1.lend a helping hand 伸出援手，助一臂之力
例句：He seldom lends a helping hand to others.
他很少对他人伸出援手。
2.let sb down 使某人失望
例句：He promised to help but he let us down.
他答应帮我们，但他让我们失望了。
3.in times of ... 在……时
例句：In times of war, we must all stand together.
在战时，我们必须要团结一致。
4.as far as I am concerned 就我个人而言
例句：As far as I am concerned, they are strongly against it.
据我所知，她们都很强烈地反对假唱。