短语 to give someone a hand 意思就是说给哪个帮忙， 助别人一臂之力。
例句
Im 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 shes 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有关的，联在一块的。
Maths and science go hand in hand theyre related subjects.
When watching a film, the images and sound go hand in hand.