We observe that the first calls for radical transformation did not begin until the period of the industrial revolution.
我们认为，首次要求彻底改革的呼声直到工业革命时期才出现。
《柯林斯英汉双解大词典》
2
The period since the revolution has been one of political turmoil.
自革命以来的这一段时期是一个政治动荡的时期。
《柯林斯英汉双解大词典》
3
The habitable zone for planets in orbit around cool dwarf stars is also much closer in, so the period of revolution is shorter — affording astronomers more frequent transits to observe.