The flood and drought became more frequent.

洪旱灾害更加频繁。

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For example, from 1951 to 2000, heavy monsoons in India became more frequent and intense, while more moderate rains happened less often.

比如说，自1951年到2000年，印度雨季的强降水发生频率升高，强度增大，而温和的降水次数有所减少。

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Soon British scientists became more frequent visitors to China which, as all recognise, is the home of many important scientific inventions.

众所周知，中国是很多重要科学发明的发源地，英国的科学家很快就成了中国的常客。

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As the date of the operation approached, my calls became more frequent.

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As sales for money replaced barter, economic exchange became faster and more frequent.

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