He also wants to get a security door.

他还想获得防盗门。

We also took away a lot of the old security doors.

我们还拆除了以前那些安全门。

Kramer buzzed at the security door, and I let him in.

【buzz】克雷默按响防盗门的门铃，我就开门让他进来了。

We can find out the cost of metal bars for the windows and a security door.

马丁：我们可以算出窗户和防盗门的金属条的成本。

A " security door" is a very thick, strong door, often made of metal, but it could just be wood that is put on the front of a house or a building to protect it.

“防盗门” 是一种非常厚实的门， 通常由金属制成，但也可能只是木头， 放在房屋或建筑物的前面以保护它。