海思3519 sdk 安装:We use a pair of scissors for ______paper.(cut)

We use a pair of scissors for ______paper.(cut) a pair of trousers是什么意思 what part of a watch do we use when we greet someone ? i got a pair of glass slipper a couple of与a pair of的区别 是a beautiful pair of shoes 对还是a pair of beautiful shoes对? a pair of 和 pair of 用法的区别在哪里? We use flour _____ a cake. A pair of shoes后面跟is还是R? 英语中a pair of 后用单数还是复数??