W-4：weigh on one's mind 压在心头
A:There must be something weighing on your mind. What is it?
A:你心里一定有事，怎么了？
B:Dad, I lost mum's necklace. I'm afraid she'll scold me.
B：爸爸，我把妈妈的项链弄丢了，我怕妈妈会责备我。
A:Don't worry. I'll buy a new necklace as same as the old one.
A:别担心，我会买一条和旧的一模一样的新项链。
B:It's so kind of you, Dad.
B：你真太好了，爸爸。
