back out语法用法
back out译为退出收回食言，违约，是动词短语，例如：
1.He put his back out lifting the crates.他搬大木箱时脊椎脱了臼。
2.I gave her a lift back out to her house我让她搭我的便车回家。
3.She could not， in good conscience， back out on her deal with him.凭良心她不能背弃与他达成的协议。
back out译为退出收回食言，违约，是动词短语，例如：
1.He put his back out lifting the crates.他搬大木箱时脊椎脱了臼。
2.I gave her a lift back out to her house我让她搭我的便车回家。
3.She could not， in good conscience， back out on her deal with him.凭良心她不能背弃与他达成的协议。