You are over weight.

你体重过重了。

The doctor said I'm a little over weight.

医生说我有一些超重。

She is over weight.

她体重太轻。

The doctor discovered that I'm over weight.

医生说我的体重过重了。

Sorry, your luggage is over weight , please buy a luggage ticket.

对不起，你的行李已超重，请补票。