on the one hand, on the other hand”表达两个对立的方面，中间用往往but连接； “for one thing, for another”表达递进关系，中间往往用and 连接。
例：
- On the one hand, smoking does harm to your health, but on the other hand, it does help you relax. 一方面，吸烟有害健康，但另一方面，又有助于你放松。
- For one thing, smoking does harm to your health, and for another, it is a waste of money. 一方面，吸烟有害健康，另一方面，吸烟还浪费钱。
