If air is needed, the oxygen mask in the plane will pop down by itself.
如果空气缺乏，飞机内的氧气面罩会自动放下。
The lack of air in the room make everyone sniffle.
屋子里空气缺乏,使得每个人都频频吸气。
The hare died for lack of air.
野兔因缺乏空气而死。
People will stifle in the absence of air.
缺乏空气之下人们会窒息。
The lack of air in the bulb prevents the filament from burning up.
灯泡内缺乏空气就使灯丝不致烧掉。
He is wanting in courage [courtesy].
他缺乏勇气 [礼貌] 。
He wants the courage to speak the truth.
他缺乏说实话的勇气.
There was no lack of gallantry and fortitude.
并不缺乏勇气和刚毅。
He lacks moral fibre.
他缺乏道德上的骨气。
She lacked the courage of her convictions.
她缺乏自信的勇气。
lack of interest that disheartened the instructor;
缺乏兴趣使教员很泄气；
lacking interest or spirit or animation.
缺乏兴趣、精神或者生气。
Lacking virility or strength.
缺乏男子气概和力量的
lacking courage or vitality.
缺乏勇气或者生命力。
lack creativity, self-discipline, courage
缺乏创造性、 自制力、 勇气
He lacks all soldier-like qualities.
他全然缺乏军人气质。
Some effects may be made worse by an inadequate supply of outdoor air or from the heating, cooling, or humidity conditions prevalent in the home.
缺乏足够的室外空气供应，及家中普遍拥有的冷暖气和加湿设备可能会加重室内空气污染。
On the battlefield, he lacked boldness; in politics he lacked creativeness; in government, he lacked justice.
他在战场上缺乏勇气，在政治上缺乏创见，在治国方面缺乏公正。