1. 照相机;摄影机;摄像机
    A camera is a piece of equipment that is used for taking photographs, making films, or producing television pictures.

    e.g. Her gran lent her a camera for a school trip to Venice and Egypt.
           她奶奶借给她一架相机,让她带上参加学校组织的威尼斯和埃及之旅。
    e.g. ...a video camera...
           摄影机

2. 在拍摄中;在摄像机前
    If someone or something is on camera, they are being filmed.

    e.g. Fay was so impressive on camera that a special part was written in for her...
           费伊很上镜,所以特地为她编写了一个角色。
    e.g. Just about anything could happen and we'll be there to catch it on camera when it does.
           几乎什么事情都可能发生,我们要赶去那里进行现场抓拍。

3. 未在拍摄时;在镜头范围之外
    If you do something or if something happens off camera, you do it or it happens when not being filmed.

    e.g. They were anything but friendly off-camera, refusing even to take the same lift.
           在银幕外,他们彼此一点也不友好,甚至不愿同乘一部电梯。
    e.g. ...off-camera interviews.
           未进行录像的采访

4. (审讯)秘密地;不公开地;私下地
    If a trial is held in camera, the public and the press are not allowed to attend.

camera的解释

    e.g. This morning's appeal was held in camera...
           今天上午的上诉不公开审理。
    e.g. They were sentenced by a military tribunal sitting in camera.
           对他们的判决是由一个军事法庭秘密作出的。