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【hold短语】
hold a meeting / party 开会/举行晚会 hold back 退缩，踌躇，阻挡，控制住
hold one’s breath 屏息，不出气 hold on 等一等，不要挂电话
hold on to 抓住，保住 hold out 伸出，坚持下去，维持
hold up 阻挡，使停顿，举起，拿起，阻滞
hold together 连在一起，团结一致
例如：
Anger flooded through her. She couldn’t hold it back.
—Could I speak to Mr Smith? —Hold on, please.
The little boy held out his hands.
I think water supplies won’t hold out much longer.
Sorry, I’m late. I was held up at work.
【knock短语】
knock at /on 敲打(门、窗等) knock down 把……撞倒，击倒
knock into 撞到，撞上某人，偶然碰见 knock sb out (of sth) 淘汰某人 knock over 撞翻，撞倒
例如：
We knocked at / on the door but there was no one there.
He was in hospital last night after being knocked down by a car.
Tom entered the classroom hurriedly and knocked into Mr. White.
He almost knocked into me before he realized it.
If no one answers the front door, try knocking at the back door.
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