If a continued high density of occupation is unavoidable, fire-resistant materials may be needed.

如果长期高密度居住的情况不可避免，可能需要使用防火材料。

youdao

If a continued high density of occupation is unavoidable, fire-resistant materials may be needed.

如果长期高密度居住的情况不可避免，可能需要使用防火材料。

youdao