If you feel drained, you feel empty of energy — very tired, as if there is nothing left to give. It is the same picture as a bath that has been drained: the water is gone.

If you feel drained, you feel empty of energy如果你覺得 drained，就是覺得精力被掏空了 very tired, as if there is nothing left to give非常累，好像什麼都擠不出來了 It is the same picture as a bath that has been drained這和浴缸被放乾水是同一個畫面 the water is gone水已經沒了

People say it after a long day, a hard talk, illness, or too much worry. It is everyday English, a little informal, and it is about energy in the body and mind, not exactly the same as sad — though actually the two can arrive together.

People say it after a long day, a hard talk, illness, or too much worry人們會在漫長的一天、一場艱難的談話、生病，或煩惱過度之後這樣說 It is everyday English, a little informal這是日常英文，有點口語 and it is about energy in the body and mind講的是身心的精力 not exactly the same as sad和難過不完全一樣 though actually the two can arrive together不過其實這兩者常常會一起出現

You can still use drained in the older, plain way too: a drained lake, drained pasta, a battery that has been drained. The tired meaning grew out of that picture.

You can still use drained in the older, plain way too你也還是可以用 drained 較舊、字面的用法 a drained lake, drained pasta, a battery that has been drained像 a drained lake（放乾的湖）、drained pasta（瀝乾的義大利麵）、a battery that has been drained（被耗盡的電池） The tired meaning grew out of that picture「很累」的意思就是從這個畫面延伸出來的

As a verb form, drained is simply the past of drain.

As a verb form當動詞形式用的時候 drained is simply the past of draindrained 就只是 drain 的過去式