密不透风的的英文：
air-tight

参考例句：

The children were playing hide-and-seek in the very thick reed marshes.
孩子们在密不透风的芦苇荡里捉迷藏。

I am stifling in this close room
在这密不透风的房间里我感到窒息。

He lofts it into the air, and hugs his head in the deep secret embrace
他抬手甩了出去，然后赶忙把头紧紧的抱了个密不透风。

air是什么意思：
n. 空气；大气；天空；空间；微风；样子；神态；气氛
v. 晾；通风；广播

There was not a breath in the air.
一丝风也没有。

a nip in the air
空气中有一种刺肤的寒冷

To fish in the air
海底捞月

Clean the air intakes regularly for sufficient air flow
定期清理进风口以保证有足够的空气流量

The switch hovered in the air.
鞭子在空中摇晃。

tight是什么意思：
adj. 牢的，紧的；紧贴的；紧凑的；不漏的；吝啬的
adv. 紧紧地；牢固地

tightness of warp
经纱紧密度

Stretch the rope tight, please.
请把绳子拉紧。

Uncomfortably tight and confining.
不适地紧绷的，不适地束缚的

He is in a tight spot.
他处境艰难。

These jeans are too tight in the crotch.
这些牛仔裤的裤裆太紧了。