helium
Definition
A chemical element, a light, non-reactive gas used in balloons, cryogenics, and as a coolant.
中文 一种化学元素,是一种轻质、不活泼的气体,用于气球、低温学和冷却剂。
Example
"The balloon floated upward because it was filled with helium."
A chemical element, a light, non-reactive gas used in balloons, cryogenics, and as a coolant.
中文 一种化学元素,是一种轻质、不活泼的气体,用于气球、低温学和冷却剂。
"The balloon floated upward because it was filled with helium."