习惯用语at recess1.在休息时间in the inmost recesses of1.在...的最深处特殊用法anchor recess1.锚穴annular recess1.环形槽auxiliary boiler recess1.辅助锅炉间bolt head recess1.弹底槽circular recess1.圆形槽pipe recess1.管道凹穴spring recess1.春假valve recess1.阀龛