15秒记一个单词第479个(20秒记一个单词第611个)
15秒记一个单词第479个(20秒记一个单词第611个)
One of the screws is loose.
有一颗螺丝松了。
英语解释:a thin pointed piece of metal like a nail with a raised spiral line (called a thread ) along it and a line or cross cut into its head. Screws are turned and pressed into wood metal etc. with a screwdriver in order to fasten two things together. 螺丝钉;螺丝: