您的问题很简单.百度知道很高兴帮助您解决您提出的问题.
原句：it is bad for you
翻译：
It is bad for you to eat too much junk food.
吃太多垃圾食品对你不好.
You must give up smoking because it is bad for you health.
您必须戒烟,因为吸烟对您的安康有害.
百度知道永远给您最专业的英语翻译.