We want to divide all of this by our wavelength, and to keep our units the same we'll do meters.
我们想用波长除以所有这些，而且为了保持单位统一我们采用米为单位。
Though it's not easy, we should always keep our spirits up for it can give us courage to face difficulties.
虽然这并不容易，但我们应该始终保持精神振奋，因为这能够让我们有勇气面对困难。
They keep our air clean, reduce noise pollution, improve water quality and provide food and building materials.
他们保持我们的空气清洁，减少噪音污染，改善水质，提供食品和建筑材料。
The flavor-sensing system, ever receptive to new combinations, helps to keep our brains active and flexible, it also has the power to shape our desires and ultimately our bodies.
味觉感应系统永远接受新的气味组合，这有助于让我们的大脑保持活跃和灵活，它也具有改变我们的欲望并最终塑造我们的身体的能力。
We keep our valuables under lock and key.
我们把贵重物品锁起来收好了。
Plants keep our air and water clean.
植物能保持空气清新和水源清洁。
The sign said, "PLEASE KEEP OUR PARK CLEAN".
指示牌上写着“请保持我们公园清洁”。
Many traditional stories tell us to be honest and keep our promises.
许多传统故事告诉我们要诚实守信。
Pollution—in general, recycling materials can produce less pollution, helping to keep our environment clean.
污染——一般来说，回收材料可以产生较少的污染，有助于保持我们的环境清洁。
To keep our city clean and beautiful, the cleaners are always very busy in the street.
为了保持我们城市的清洁和美丽，清洁工总是在街道忙碌着。
Our thick fur and fat keep our body temperature at 40°C. We can stay warm!
我们厚厚的毛和脂肪使我们的体温保持在40摄氏度。我们可以保持温暖！
If we keep our sadness and hatred in our hearts, we will have to carry them around all our lives.
如果我们把悲伤和仇恨藏在我们心里，我们就得一辈子带着它们。
Playing an instrument or singing, says Nina Kraus, can help us do better in school and keep our brain sharp as we get older.
尼娜·克劳斯说，弹奏乐器或唱歌可以帮助我们在学校表现得更好，且随着年龄的增长，我们的大脑也会保持敏锐。
Our local radio or TV station can give information about where to get help or what to do to keep our family and home safe.
我们的地方电台或电视台可以为我们提供一些信息，包括在哪里能得到帮助或者怎样做才能维护我们的家庭安全。
"The bird movements can help keep our knees healthy and the monkey movements can be good for the heart," said Hua Yi, the 59th inheritor (继承人) of Wuqinxi.
“鸟戏能帮助维持膝盖健康，而猴戏对心脏有好处。”五禽戏第59代传人华艺说。
Think about all the other service workers we have in this community. We have people who collect waste and rubbish and keep our community sanitary. We have road workers who put up and repair traffic signs and fix holes in the streets to protect not just us, but our cars!
想想这个社区的其他服务人员。我们有收集垃圾的人，他们负责保持社区卫生；我们有道路工人，他们竖起、修理交通标志牌，维修道路，不仅保护着我们自己，也保护着我们的汽车！
让我们梦想常在。
We should keep our streets clean.
我们应该让街道保持干净。
How do we keep our bodies healthy?
我们如何保持身体健康？
We try to keep our expenses as low as we can.
我们努力把开支保持在尽可能低的水平。
Our income tax now goes in part to keep our neighbors alive.
我们的所得税现在部分用于维持我们邻居的生活。
Our nails are weaker than the nails that animals have, but they can keep our fingers safe.
我们的指甲比动物的指甲脆弱，但可以保护我们的手指安全。
"Archiving practices have changed greatly since the 1970s," says Kapsalis, "and we keep our high value documents in a safe that I don't even have access to."
卡普萨利斯说：“20世纪70年代以来，档案管理流程已经发生了翻天覆地的变化，我们会把价值很高的文档存放在一个保险箱中，甚至连我都无法打开。”
We wear clothes to keep our bodies warm.
我们穿衣，使身体保持温暖。
We stamped the ground to keep our feet warm.
我们跺脚取暖。
How can we keep our wills free?
怎样保持自由的意志？
我们要遵守我们的承诺。
我们要遵守我们的承诺。
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