他还说：“当你看了生物学以后就会发现，任何级别的烟雾含量都是不安全的。”

"When you look at the biology, there is no safe level of exposure to tobacco smoke," he says.

youdao

他还说：“当你看了生物学以后就会发现，任何级别的烟雾含量都是不安全的。”

When you look at the biology, there is no safe level of exposure to tobacco smoke, "he says."

youdao

他还说：“当你看了生物学以后就会发现，任何级别的烟雾含量都是不安全的。”

When you look at the biology, there is no safe level of exposure to tobacco smoke, "he says."

youdao