High-volume ratio: a compact design, small size, light weight, flexible and convenient to carry.

高容积比：紧凑设计，体积小，重量轻，携带灵活方便。

youdao

High-volume ratio: a compact design, small size, light weight, flexible and convenient to carry.

高容积比：紧凑设计，体积小，重量轻，携带灵活方便。

youdao