Translation of "Background" in Chinese

Tom has a veterinary background.

Tom有獸醫背景。

Does your family background involve Chinese medicine?

您的家族史跟中医有没有关系？

There is a castle in the background of the picture.

图片的背景是一座城堡。

You will need to bring two passport-sized photos of yourself taken with a white background.

您需要带两张本人的白底报名照。