来回式呼吸装置,往返式吸收装置的英文

to and fro absorption system

• 来回:    make a round trip; ...
• 式:    type; style
• 呼吸:    breathe; respire
• 装置:    installation; devi ...
• 往返:    go there and back; ...
• 吸收:    absorb; suck up; s ...