门栏的英文：
door bar
threshold

door是什么意思：
n. 门，门户；途径

The door was unclosed.
门被人打开了。

This door is manual.
这个门是要用手操作的。

Who is knocking the door || Who is knocking || Who is at the door || Who is knocking at the door?
谁在敲门

bar是什么意思：
n. 条，棒，杆；栅栏；酒吧间
v. 闩上；阻挡；排斥

To exclude or shut out;bar.
把…排除在外；把…排除在外，不予考虑

To exclude or rule out;bar.
除去，排除；排斥

She is reading for the bar exam.
她正在攻读律师专业。

threshold是什么意思：
n. 极限；临界值；门槛，入口；开始

The threshold of a physiological or psychological response.
阈限生理或生理反映的下限

The threshold varies depending on your system.
该阈值因系统而异。

We are on the threshold of a new era in astronomy.
我们很快就将迎来天文学的新纪元。