There are blowholes in the floor which has a hollow lumen and strnthen grids 地板有通风孔，内腔空心或加强型格栅
My castles ' ventilation ducts will be too small to crawl through 我所属的建筑物通风孔将会小到没有任何人爬的进去
Standard for safety for automatically operated roof vents for smoke and heat 用于烟和热的自动操作屋顶通风孔的安全标准
Practice for sampling of process vents with a portable gas chromatograph 使用便携式气相色层分析仪进行工艺通风孔取样的惯例
Bv bowl vent port 浮桶室通风孔
In doing so , it prevents the smoke cause by fire channels to the lift shaft when any fire breaks out 这样做，可预防当火灾爆发时因火势引道而造成烟雾进入电梯通风孔。
If the unit is placed under the floor carpet , floor mat , or otherwise covered , the ventilation openings and heat sink cannot provide sufficient cooling , leading to overheating and the risk of fire or serious accidents 如果本机放在地毯、地板垫或其它覆盖物之下，通风孔和散热片将不能对本机进行充分冷却，从而导致本机过热，并有发生火灾或严重事故的危险。
For example , a single blade of grass is still more stable than any kind of comparable mechanical construction , spiders make thread that is as strong as steel and termites are able to survive in the intense sun by building elaborate airways in the dirt 例如，单片草的齿边依然比任何一种类似的机械仿制结构要坚固，蜘蛛织的丝有如钢铁一般坚韧，白蚁通过在泥土中挖掘独特的通风孔而可以在烈日下生存。
