第三人称单数:throws in 现在分词:throwing in 过去式:threw in 过去分词:thrown in
1.投入,扔进
2.发边界球
3.注入;插入;使(齿轮等)咬合,接合;【电学】接通;添加
1.to include something extra with something that you are selling, without asking for more money
2.to add a remark, question, etc. in a conversation