双管: double-barrelled直接: direct; immediate回水: ascent; backwater; damming; ...系统: system双管直接回水供暖系统: two pipe direct return system直接回水制: direct return system; direct-return system开式回水系统: open return system湿式回水系统: wet return system; wetreturnsystem真空回水系统: vacuum returnline system重力回水系统: gravity return system直接浸水系统: direct flooding system直接热水系统: direct hot water system直接注水系统: direct flooding system直接回火: direct teemingtopouring direct tempering; direct tempering直接回家: go right home直接回扣: immediate rebate直接回流: direct recoup直接回授: direct feedback直接回忆: direct recall直接回应: direct-response氨直接回收法: direct ammonia recovery直接回镜检查: direct pharyngoscopy供水系统, 水系: water system氨气直接回收法: direct ammonia recovery直接回到起始位置: go right back to the beginning
