I'm writing an email to my cousin.
我正在给我的表弟写一封邮件。
I'm writing an email to my friends from the earth.
我正在给地球上的朋友写邮件。
I'm writing an email to my new pen pal in Australia.
我正在给我在澳大利亚的新笔友写邮件。
Alex is writing an email so that John will know what he is doing.
亚历克斯正在写一封电子邮件,以便约翰知道他在做什么。
It can be useful to filter out external stimuli if you are writing an email in a noisy coffee shop, for example, or are searching for a camouflaged insect in a rainforest.
例如,要是你在在嘈杂的咖啡馆里写一封电子邮件或在雨林里搜寻一只伪装的昆虫,能过滤掉外部的刺激就很有用。

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