短语 to give someone a hand 意思就是说给谁帮忙， 助他人一臂之力。

例句

I'm really finding my homework difficult. Can you give me a hand?

Look at all the washing up! I really need someone to give me a hand!

Louise is so kind – she's always ready to give you a hand with anything.

请注意

另一个短语 go hand in hand 的意思是两件事情是密切相关的，联在一起的。

Maths and science go hand in hand – they're related subjects.

When watching a film, the images and sound go hand in hand.