top vent

基本解释

Alaska - Steam rises from the top vent in the summit crater of Mount Redoubt.
阿拉斯加，蒸汽从山顶上的火山口喷发。
blog.sina.com.cn
The top riser vent with big mesh size has excellent ventilation. It also effectively guard against flies.
上方大网目透气网孔，通透气佳，即可有效预防苍蝇入侵。
A cathode ray tube, CRT, you either remove the plastic housing around the tube, this is easy enough, or you work through the vent panels in the top of the housing.
CRT显示屏的阴极射线管，要么把包着管子的塑料外壳扒掉，其实挺简单的，要么直接从显示器外壳上的通风孔盖板走。