Etas
(ETA 的复数) 估计的到达时间
🗣️ 情景例句
since her mother died.
因为她妈妈去世了。
Jack will feel sorry when she leaves.
她一走，杰克会觉得悲伤的。
Once the existence of this wave-length had been discovered,
一旦这种波长的实际存在被发现，