指阴、阳二气，出自“柔上而刚下，二气感应以相与”。
阴阳二气 Yin and Yang ; Jing Fang
娇骄二气 Jiao jiao two gas
二气化硅 sillicon dioxide
第二气体效应 second gas effect
二气化乙酰基 acetyl dioxide ; acetyl peroxide
第二气门 [昆] duaspiracle ; [昆] second spiracle
西气东输二线西段工程 supplying gas through the western section of the second line of the project for shipping natural gas from west to east
充气二极管 [电子] gas diode ; gas filled rectifier diode ; [电子] gas-filled diode ; filled diode
应注惫动作的连贯性二气呵成。
On pours the exhausted movement the continuity two to be mad that becomes.
第二次发作很严重，他的气道肿胀，无法呼吸，血压突然下降，心脏停了一会儿。
The second attack was so serious that his airway swelled, preventing him from breathing, his blood pressure dropped suddenly, and his heart stopped for a moment.
第二天天亮了，万里无云，天朗气清。
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