森林火灾时常由碎玻璃或香烟头引起。
Forest fires are often caused by broken glass or cigarette ends.
森林火灾大多是由破碎的玻璃或人们随手扔掉的未熄灭的烟头引起。
Forest fire are often caused by broken glass or by cigarette ends which people carelessly throw away.
森林火灾时常由破碎的玻璃或人们随手扔掉的香烟头引起。
Forest fires are often caused by broken glass or by cigarette ends which people carelessly throw away.
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