increase的主动与被动

Question

The rainfall is increased across South America, bringing floods to Peru.
在这句话里，increase是被动形式吗，什么时候用主动形式？

Answer 1

increased在这里是形容词，表示增加的。
an increased incidence of childhood leukaemia

1. to increase增加（increase为不及物动词）
increase to become larger in number, amount, or degree :
Sales increased by 25%.
The level of violence has increased.

2. to make something increase使增加（increase为及物动词）
increase to make something larger in number, amount, or degree :
Being overweight increases the risk of having a heart attack.
The rainfall is increased across South America, bringing floods to Peru.

The rainfall is increased across South America, bringing floods to Peru.
整个南美降雨量增加，给秘鲁带来洪水。（译文中将英文形容词译作中文动词，即increased增加的译作增加）

In everyday English, people usually say that an amount or level goes up rather than increases
在日常生活中，当人们提到数量或水平提高时，常用"goes up"。
The population has gone up a lot.
Her investments all went up in value.

习惯用语：
on the increase 不断增加, 有增无己
increase with 随...而增长

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