浮力调整背心

BCD / Buoyancy Compensation Device (diving)

to float / superficial / floating / unstable / movable / provisional / temporary / transient / impetuous / hollow / inflated / to exceed / superfluous / excessive / surplus

buoyancy

power / force / strength / ability / strenuously

to transfer / to move (troops or cadres) / to investigate / to enquire into / accent / view / argument / key (in music) / mode (music) / tune / tone / melody

to harmonize / to reconcile / to blend / to suit well / to adjust / to regulate / to season (food) / to provoke / to incite

to adjust / adjustment / revision / CL:個|个[ge4]

exactly / in good order / whole / complete / entire / in order / orderly / to repair / to mend / to renovate / (coll.) to fix sb / to give sb a hard time / to mess with sb

variant of 背[bei1]

to be burdened / to carry on the back or shoulder

the back of a body or object / to turn one's back / to hide something from / to learn by heart / to recite from memory / unlucky (slang) / hard of hearing

sleeveless garment (vest, waistcoat, singlet, tank top etc) / CL:件[jian4]

heart / mind / intention / center / core / CL:顆|颗[ke1],個|个[ge4]