二级头呼吸器 (二級頭呼吸器)
 èr jí tóu hū xī qì
 Pinyin
Definition
二级头呼吸器 (二級頭呼吸器)
 - 
              - (diving) regulator
 - demand valve
 
Character Decomposition
Idioms (20)
一不做,二不休
  - 1 don't do it, or don't rest (idiom); either give up, or go through to the end
 - 2 Since we started, we must carry it through whatever happens.
 - 3 in for a penny, in for a pound
 
一干二净
  - 1 thoroughly (idiom)
 - 2 completely
 - 3 one and all
 - 4 very clean
 
一分为二
  - 1 one divides into two
 - 2 to be two-sided
 - 3 there are two sides to everything
 - 4 to see both sb's good points and shortcomings (idiom)
 
一呼百应
  - 1 a hundred answers to a single call (idiom)
 - 2 to respond en masse
 
一呼百诺
  - 1 one command brings a hundred responses (idiom); having hundreds of attendants at one's beck and call