1. stock up on sth. 囤积；储备
We need to stock up on some healthy snacks: wholegrain cereal bars, dried fruit and nuts, easy-to-eat fruit.
我们要常备健康小食，比如全麦条糕，水果干，坚果，方便食用的水果什么的xouqwxa6BP。

2. hold on to sth. 紧紧抓住
When he jumped, his feet did not hold on to the bark.
跳的时候，他的脚爪抓不住树皮VRWC%e#w*O=Gfs#*s。

3. hop up 突然弹/跳起来；突然出现
They laugh, chat and occasionally hop up to break into a goofy dance.
他们笑着、讨论着，有时候甚至突然蹦起来跳一段滑稽的舞蹈JbUd%*O*J%RD]Wi(V。

4. rock back and forth 前后摇晃
If you want to move you can rock back and forth with him.
想动的话，你可以和他一起前后摆动Uw#~vI-(iV.xO2];i~。