When I was a little boy, there was a time when I went to fish with my elder sister.
当我还是个小男孩的时候，有一段时间我和我姐姐去钓鱼。
This ancestral species might have evolved at a time when the islands were connected.
这种祖先物种可能是在岛屿相连的时候进化而来的。
This occurs at a time when other nations have made significant gains in their own research capabilities.
这种情况发生在其他国家自身科研能力取得重大进展的时候。
Why protect chlorophyll at a time when the tree is breaking it down to salvage as much of it as possible?
在树木将叶绿素分解，以尽可能多地将其回收的时候，为什么我们还要保护叶绿素呢？
The content and format of explanations dated back to a time when the museum was the exclusive domain of the scientific researcher.
解释的内容和形式可以追溯到博物馆是科学研究人员的专属领域那个时代。
It is advantageous for a kangaroo female to produce young at a time when plant productivity is sufficient to support her offspring.
袋鼠雌袋鼠在植物繁殖力充足的时候生育后代是有利的。
Members of the Academy hoped that this might encourage the Royal Family to keep the Academy open at a time when many in the government were considering closing it.
学院的成员们希望，在许多政府成员考虑关闭学院的时候，这会鼓励皇室保持学院开放。
Scientific publishers routinely report profit margins approaching 40% on their operations at a time when the rest of the publishing industry is in an existential crisis.
当其他出版商陷入生存危机之际，科学出版公司的运营利润率却如往常一样接近40%。
Some are turning to the internet, which is cheaper and offers concrete measurements like click-through rates—especially important at a time when marketing budgets are tight.
有些人转向了互联网，因为它更便宜，而且提供了诸如点击率这样的具体统计结果，这在营销预算紧张的时候尤为重要。
There comes a time when children need to know more than the basic facts of life.
儿童到了一定的时候就需要了解更多的性知识。
He worries about a time when college athletics become even more elitist than they are now.
他担心有一天大学体育运动会变得比现在更加精英主义化。
There was a time when each teacher spent an hour, one day a week, testing students in every subject.
曾有一段时间，每个老师每周都花一小时来测验学生的各门功课。
He might feel that leveraging the company at a time when he sees tremendous growth opportunities would be a mistake.
他可能感觉到在看到巨大的发展机会时举债经营公司是一个错误。
Yuan Longping was born in the year 1930, a time when China was very different.
袁隆平出生于1930年，那时的中国与现在大不相同。
It was a time when many people had just made the hard journey back to their hometowns.
那时候，许多人刚刚踏上返回家乡的艰难旅程。
They hide and watch for a time when they see their family and neighbours coming to their funeral in the church.
当他们看到家人和邻居来到教堂参加他们的葬礼时，他们就躲起来看了一会儿。
Linguists believed it helped a new country achieve unity and cultural independence at a time when most people cared about political freedom.
语言学家认为，在大多数人关心政治自由的时候，它帮助一个新国家实现了统一和文化独立。
Boxing Day, the 26th of December, got its name from a time when many rich families gave boxes of gifts to poor people who had to work at Christmas.
节礼日是12月26日，起源于圣诞节时期，在这个时期许多富裕家庭会给必须工作的穷人送礼物。
By the 1760s, they were losing millions of pounds each year to Dutch traders, a huge amount of money in a time when ￡60 a year was considered a good income.
到了18世纪60年代，他们每年要输给荷兰商人几百万英镑，在年收入60英镑被视为高收入的时候，这实在是一笔巨款。
Artist Michael Craig-Martin said: "Andria's brilliant project to bring artists from all fields into direct contact with children is particularly welcome at a time when the arts are being downgraded in schools."
艺术家迈克尔·克雷格-马丁说：“在这个艺术在学校里被降级的时代，安德里亚让来自各个领域的艺术家与儿童直接接触，这样出色的项目特别受欢迎。”
There was a time when kids enjoyed being kids.
曾经孩子非常享受作为孩子的时光。
They are failing to look ahead at a time when planning for the future is more important than ever.
当规划未来比以往任何时候都重要时，他们却未能极目前瞻。
At a time when beards meant a great deal religiously, he's telling the men to shave off their beards.
在那个时代，胡子在宗教上有非常重要的意义，他告诉男人们剃掉他们的胡子。
We tend to think of the Depression as a time when families pulled together to survive huge job losses.
我们往往认为，在大萧条时期，家庭成员齐心协力，共同面对失业带来的巨大损失。
That, at least, is some comfort at a time when our national economy seems to be searching for its next story line.
当下，我们的国民经济似乎正在寻找下一个“故事情节”，这至少是一种安慰。
Paying kids for housework is one of the most popular topics, especially at a time when everyone is more careful about money.
为孩子做家务付钱是最流行的话题之一，尤其是在这个大家都对钱都更谨慎的时代。
He envisaged a time when soldiers who are wounded fighting overseas are put in mobile surgical units equipped with computers.
他设想在某一天，海外作战受伤的士兵会被安置在配备有电脑的移动外科病房。
At a time when natural history was a valuable tool for discovery, Merian discovered facts about plants and insects that were not previously known.
在那时，自然史是很有价值的探索工具，梅里安发现了有关植物和昆虫的真相，这些真相从未为人所知。
There was a time when social pressures were killing off the Welsh language, but after years of efforts, it is now an active part of Welsh life again.
曾经有一段时间，社会压力使威尔士语逐渐消亡，但经过多年的努力，威尔士语现在再次成为威尔士人生活中活跃的一部分。
The burger business faces more pressure from regulators at a time when it is already adapting strategies in response to shifts in the global economy.
在汉堡产业已经在调整战略以应对全球经济变化之际，它还面临着来自监管机构的更多压力。
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