之后，据推测太阳会成变成一颗红巨星，因为到那时候现在构成太阳的氢气燃烧殆尽，太阳转而燃烧氦气。

After that it is expected to become a red giant, as the hydrogen that presently comprises it is exhausted and the sun switches to burning helium instead.

youdao

现在不是胆怯的时候。

This is no time to be faint-hearted.

《柯林斯英汉双解大词典》

现在是改弦易辙的时候了。

It's time to try a change of tactic.

《牛津词典》

I love chemistry now. Be very careful what you say. Have any of you made that statement about hating a subject?

我现在很喜欢化学,所以你们说话的时候,可要小心咯？

麻省理工公开课 - 化学原理课程节选

But now we're going to take a close look at Deuteronomy and we'll pick up with Joshua on Wednesday.

现在，我们将详细的学习申命记,在周三的时候再开始约书亚记。

耶鲁公开课 - 旧约导论课程节选

And in fact today, right now, we're going to move back the furthest we go, all the way into the nineteenth century to talk about the early Yeats.

实际上今天，现在，我们会回到很早的时候，直到十九世纪,来谈谈早期的叶芝。

耶鲁公开课 - 现代诗歌课程节选