pocketknife
n. 随身小折刀
1. a knife with a blade that folds into the handle; suitable for carrying in the pocket
Steven killed the bird with his pocketknife.
史蒂文用随身带的小刀杀死了这只小鸟.
I got a really good pocketknife for $ 10.
我花十美元买了一把非常好的折叠刀.
Now, use your pocketknife to touch the mica and see what will happen.
现在你用小刀去触及岩石中的云母,看看会产生什么现象.