Propellants
出国 Abroadn. 推进剂; 推进物( propellant的复数形式 )
🗣️ 情景例句
I received a letter from my parents this morning.
今天早上我收到父母一封信。
Just to be on the safe side.
为了安全起见。
But a watch could never repair itself----it does not consist of living parts,
但是，手表决不会自行修理，它不是由有生命的部件组成，