helium
英 ['hi?l??m]
美['hil??m]
- n. [化學(xué)] 氦（符號為He，2號元素）
英英釋意
- 1. a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas)