"It is behind the door" 表示事物或人体在门背后。这是一个比较常用的短语，没有特殊的来源。
下面是一些使用这个短语的英文例句，并附有中文翻译：
"I can't find my keys. I thought I left them on the table, but they're not there. Oh wait, I remember now. I put them behind the door last night before I went to bed." (我找不到我的钥匙了。我本以为我把它们放在桌子上，但它们不在那里。噢，等等，我现在想起来了。我昨晚睡前把它们放在了门背后。)
"I heard a loud noise coming from the other room. I opened the door and saw that my cat had knocked over a vase. It was behind the door." (我听到另一间房间传来巨大的噪音。我打开门，看到我的猫把花瓶推倒了。它在门背后。)
"I found a hidden compartment behind the door in my closet. It's the perfect place to store my valuable jewelry." (我在衣柜的门背后发现了一个隐藏的储藏空间。这是存放我的贵重珠宝的完美地方。)
下面是一些使用这个短语的英文例句，并附有中文翻译：
"I can't find my keys. I thought I left them on the table, but they're not there. Oh wait, I remember now. I put them behind the door last night before I went to bed." (我找不到我的钥匙了。我本以为我把它们放在桌子上，但它们不在那里。噢，等等，我现在想起来了。我昨晚睡前把它们放在了门背后。)
"I heard a loud noise coming from the other room. I opened the door and saw that my cat had knocked over a vase. It was behind the door." (我听到另一间房间传来巨大的噪音。我打开门，看到我的猫把花瓶推倒了。它在门背后。)
"I found a hidden compartment behind the door in my closet. It's the perfect place to store my valuable jewelry." (我在衣柜的门背后发现了一个隐藏的储藏空间。这是存放我的贵重珠宝的完美地方。)