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In January 1910, Shirase put his plans before Japanese government officials, promising to raise the flag at the South Pole within three years.

1910年1月，Shirase 将他的计划提交给日本政府官员，承诺在三年内在南极竖起国旗。

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This medicine is effective if used within three years.

这种药3年以内有效。

《新英汉大辞典》

Girls are advised to begin testing within three years of when they first have sex, or in any case no later than twenty-one.

VOA: special.2009.11.25

Fenton says within three years the cost of large solar plants should be the same as for coal or oil power plants.

VOA: standard.2009.10.27

After initially resisting the government's push, the grandes ecoles say they will try to meet the 30 percent goal within three years.

VOA: standard.2010.02.02

Within three years of formation, the company came up with the concept of a subscription service.

FORBES: Where Is Netflix's DVD Business Headed?

Mr Fyfe said that under Scots law, cases should be brought within three years.

BBC: Scotland

If they do not pay within three years you can sue for quiet title.

FORBES: Chase Tries to Fix Mortgage Screw-up by Arguing Borrower Not Good at Latin