隧道周边的英文：
tunnel perimeter

tunnel是什么意思：
n. 地下通道；洞穴
v. 挖掘隧道；打开通道

The engineers sank a tunnel into the ground.
工程师们在地下挖了个隧道。

The exit of the tunnel is concealed.
地道的出口开在隐秘的地方。

A tunnel was to be blasted through the mountains.
一条隧道要被炸开，穿山而过。

They drove a tunnel through a hill.
他们通过小山挖一隧道。

The roof of the tunnel fell in.
隧道顶部塌了下来.。

perimeter是什么意思：
n. 边界；外缘；周长

What is the perimeter of the polygon?
这个多边形的周长是多少?

Iverson has the penetration ability and perimeter.
艾佛森拥有突破和外围投射能力。

A fence marked the perimeter of the field.
一道篱笆标明了那块田地的周界。

The perimeter of the airfield is protected by guard - dogs.
机场外的环形防卫圈由警犬保卫着。

Guards have been posted at several point around the perimeter.
在环形防线上已布置了几处岗哨。