milk let-down reflex 溢乳反射
Bearing down reflex 分娩时屏气用力反射
down reflex
向下反射
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The compact wireless subwoofer, which can be placed anywhere in the room, features a down-firing bass reflex design for accurate bass and a more realistic sound.
ENGADGET: Harman Kardon SB 30 has two listening modes, costs eight Benjamins
应用推荐
模块上移
模块下移
不移动