如果第二天去旅行我就早睡。

I go to bed early if I'm travelling the next day.

《牛津词典》

如果第二年有足够的雨水形成另一个湖泊，卵就会孵化，小虾会再次快速地经历生长、成年、产卵和死亡的循环。

If sufficient rain falls the next year to form another lake, the eggs hatch, and once again the shrimps pass rapidly through their cycle of growth, adulthood, egg-laying, and death.

youdao

第二阶段仍然是测试疫苗的安全性，但主要是检测疫苗是否有效。如果第二阶段进展顺利，疫苗研发就可以开始第三阶段。

Phase 2 still tests the vaccine's safety, but it's mainly a test to see if the vaccine seems to work. If Phase 2 goes well, the vaccine can begin Phase 3.

youdao

If you take some from column one or two and you mix it with some from column eight and nine, bingo, you have reaction.

如果你从第一列或者第二列中选出一些元素,将其与第8列或者第9列的元素混合，好，就会发生化学反应。

麻省理工公开课 - 固态化学导论课程节选

So you should have gotten two handouts as you came in, and if you didn't, please raise your hand and a TA will come to you and get you that second handout.

因此你们应该都在进来的时候拿到了两份讲义，如果你没有，请举手示意，助教会过去,给你第二份讲义。

麻省理工公开课 - 化学原理课程节选

And secondly, if I'm successful in my teaching I will accomplish this second aim here.

第二,如果我的教学目的达到了,我就会实现第二个目标

耶鲁公开课 - 聆听音乐课程节选