drop behind
落伍, 落后
例句与用法:
John and Jack had dropped behind in order to be alone and have a talk.
为了能单独在一起谈谈,约翰和杰克故意走在别人后面。
Soon I dropped behind the rest of the class.
不久我就落在班上其他同志后面了。
落伍; 落后
The production of the factory has been dropping behind in the last few months.
那家工厂的生产量近几个月来一直在下降。