A smile can brighten the darkest day and make life more beautiful.

一个微笑可以照亮漆黑的夜晚，让人生更加美丽。

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Yesterday was the darkest day for my uncle, because he had a severe car accident.

昨天对我的叔叔来说是最黑暗的一天，因为他发生了严重的车祸。

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It is the darkest day today throughout the entire year, though it is sunny and brilliant in the daytime.

今天是一年中最黑暗的日子，虽然白天阳光灿烂如花。

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"This is the darkest day in the history of the Santa Cruz Police Department, " Police Chief, Kevin Vogel.

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World ice hockey chief Rene Fasel said the crash in Yaroslavl was "the darkest day in the history of our sport".

BBC: Ice hockey world mourns Yaroslavl air crash in Russia

"It's being called the darkest day in our history, " he said.

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