The heart muscles contract to expel the blood.
心脏肌肉收缩以挤压出血液。
They both take in and expel matter.
他们既吸取物质也排放物质。
We managed to expel the enemy from the trench.
我们终于把敌人赶出战壕。
The headmaster may expel the boy from the school.
校长可能要把那个男孩从学校开除。
To expel a current of air, AS from the mouth or from a bellows.
从嘴或风箱中往外送气。
The bacteria are spread into the air when infected people talk or expel air suddenly.
当被感染人群说话或突然呼气时，这种病菌就被传播到空气中。
The bacteria are spread into the air when infected people talk or expel air suddenly.
当被感染人群说话或突然呼气时，这种病菌就被传播到空气中。
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