当然，如果在室内使用无线光通信，就没有必要担心恶劣天气。
There is no need to worry about bad weather when using FSO indoors, of course.
灾民面临的危险因素包括：人群拥挤、在室内使用明火煮食、和营养不良。
Risk factors among displaced persons include crowding, exposure to indoor cooking using open flame, and poor nutrition.
这种炉子的使用应保证附近没有煤气泄漏，木炭只能在室外点燃，室内使用会导致一氧化碳中毒。
Charcoal should be burned only out of doors. Use of charcoal indoors will lead to carbon monoxide poisoning.
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