This rain has come at just the right time.

这场雨下的是时候。

《新英汉大辞典》

Groupon wasn't just a good idea at the right time, it was an idea exploited to full effect, in ways that will be studied by founders of other startups for years to come.

Groupon是在正确时间建立的一家正确的公司，它创意十足，执行充分，必将成为未来创业企业研究的典范，对整个行业产生影响。

youdao

At this time, I can't be able too parsimonious. Just right the winter will come, the weather turns colder and colder, my gift will play its role.

正好寒冷的冬天渐渐近了，天气也越来越冷了，我的礼物在这个时候刚好能起到它防寒预暖的作用。

youdao

And the flu bug has come along at just the right time for the government to use it as the perfect excuse.

BBC: By political correspondent Nick Assinder

But he has come to town at just the time when the Democratic Party is shifting to the right.

ECONOMIST: American politics