一、例句 (EXAMPLES) Once you decide, you can’t change your mind. 一旦你做了决定，就不能改变主意。 Once you have a stomachache, take the medicine twice a day. 一旦你肚子疼，就一天吃两次这种药。 Once he finds out what you’ve done, he’ll get mad. 一旦他发现你做了什么，他会生气的。 二、对话 (DIALOGUES) A: My friends have been asking me to smoke cigarettes with them. A: 我的朋友们一直邀请我和他们一起抽烟。 B: Be careful! You don’t give in to peer pressure. B: 小心！你不要屈服于同伴压力。 A: Why? A: 为什么呢？ B: First of all, smoking is bad for your health and second, once you start smoking it will be hard to stop. B: 首先，吸烟有害健康；其次，一旦你开始抽烟，就很难戒掉。 A: Yeah, you’re right. I know a lot of people who are addicted to smoking. A: 是的，你说得对。我认识很多人都抽烟上瘾了。 B: I bet most of them started because their friends also smoked. B: 我敢说他们大多数人开始抽烟是因为他们的朋友也抽烟。 A: You’re right. I won’t do it. I won’t smoke with my friends. A: 你说得对。我不会那么做的。我不会和朋友们一起抽烟。