To establish such a chronology, it is necessary to determine the relative amounts of land ice that existed at various times in the Earth's past.

为了建立这样一个年表，有必要确定地球过去不同时期存在的陆冰的相对数量。

youdao

Modern woman has been freed from many of the duties that befell her sisters in times past.

现代女性已从旧时代姐妹们肩负的许多责任中解放出来了。

《柯林斯英汉双解大词典》

The passenger put it, "In the past few hours, you have asked me whether I needed help or not for twelve times in all."

乘客说：“在过去的几个小时里，你问我需不需要帮助总共有12次。”

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I was excited myself. I had visited Guyana as a reporter a number of times in the past.

VOA: special.2011.01.08

He added celebrity gossip too, which The London Times would never do in the past.

他还史无前例地加入了名人八卦,这是《泰晤士报》过去永远不会做的

耶鲁公开课 - 金融市场课程节选

The number of visitors has increased by ten times in the past fifteen years.

VOA: special.2009.06.03

With this in mind, and in an effort to stoke up lending, the People's Bank of China has cut the amount of money that banks need to keep in reserve three times in the past few months.

BBC: China home price rise indicates small rebound in demand

In fact, she's visited the country three times in the past few years: Cancun, Cozumel and Mexico City.

CNN: Traveling abroad? Here's some advice after U.S. mom jailed in Mexico

Bees could, once again in theory, be treated with antiviral drugs or, alternatively, the virus might burn itself out. (A recent paper co-written by van Engelsdorp shows that unexplained honeybee die-offs have occurred in the U.S. fourteen times in the past hundred years.) Finally, there is the possibility that C.

NEWYORKER: Stung