这一层次的需要包括两个方面的内容。
你的身体就像其他机器一样，偶尔也需要一次全面保养。
Your body, like any other machine, needs a full service once in a while.
社区领导人说需要进行一次彻底的部门大改组。
Community leaders say a complete departmental shake-up is needed.
他们需要更多的时间来考虑是否进行一次调查。
They needed more time to consider whether to hold an inquiry.
这些墙需要一次好好的刷洗。
我们需要一次新奇的旅行来调剂一下生活。
经济需要压过了军事扩张，这将是人类有史以来的第一次。
It would be the first time in human history that economic necessity has prevailed over military aggrandizement.
我们需要从一个新的角度去展开下一次广告活动。
你需要做一年两次的常规检查。
他的动脉再次栓塞，需要再做一次同样的外科手术。
His arteries were blocked up again, requiring him to undergo repeat surgery.
我认为我不需要再讲一次你们下节课的阅读作业；有一个图表已经说明地非常清楚了。
I don't think I need to draw any echoes, your reading assignment for the next class; it has a diagram that shows this very clearly.
在这方面再一次地，我们需要以孩子为榜样，他们是不把幸福当做目标而是当做生活方式的自然副产品的人。
And in that, once more, we need to look to the example of our children, to whom happiness is not a goal but a natural byproduct of the way they live.
我们需要改变教授工程学的方式，让它成为学生们一次愉快的经历。
We need to change the way we teach engineering to make it an enjoyable experience for students.
我们重新开始的时候发誓过，我们只会更换我们需要的东西，而且这一次我们会做正确的事。
We vowed when we started over, we'd replace only what we needed, and this time we'd do it right.
所以，这一次，我需要付出更多的努力，希望我第一次就能成功。
So, this time, I'll need to make a lot more effort, and hopefully, I'll be successful the first time.
据报道，谷歌的自动驾驶汽车行驶了1023330公里，期间需要人工干预124次。
According to a report, Google's self-driving cars clocked 1,023,330 km, and required human intervention 124 times.
有一次，教授并没有要求学生购买教科书，只是需要作业提交的访问码。
In one case, the professor didn't require students to buy a textbook, just an access code to turn in homework.
环保灯对地球来说是好的，而且它很省钱、方便，因为它不需要每隔几个月就更换一次。
The eco-light is good for earth, and it's cost-effective and convenient, because it doesn't have to be changed every few months.
我们需要的是第二次绿色革命。
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。”
The passenger put it, "In the past few hours, you have asked me whether I needed help or not for twelve times in all."
和造型师一起一次买完所有你需要的衣服，而不是独自购物、一次只买一件衣服。
Buy all your clothes at once with a stylist instead of shopping alone, one article of clothing at a time.
它们让你通过做一次工作来省力，而不用你每次需要它的时候都重新做一遍。
They allow you to save effort by doing work once instead of repeating it each time you need it.
在我们进行了一次简短的谈话后，我平静了一些，这正是我所需要的。
We had a little conversation which calmed me down a bit, and that was just what I needed.
每一次跳跃都需要周密的计划和专业的节奏把控。
它扁平的形状意味着土卫八曾经旋转得非常快，完成一次自转需要16个小时。
Its flattened shape implies that Iapetus once spun very quickly, completing a rotation in 16 hours.
正因此，我们需要再一次以我们的孩子为榜样，对他们来说，幸福不是目标，而是生活方式的自然的副产品。
In that, once more, we need to look to the example of our children, to whom happiness is not a goal but a natural byproduct of the way they live.
然而，当早期的人类第一次开始反思周围事物的本质，他们发现只是为了让思维保持有序也需要有数字的概念。
However, when early humans first began to reflect on the nature of things around them, they discovered that they needed an idea of number simply to keep their thoughts in order.
这一次，我需要付出更多的努力，希望我一次就能成功。
This time, I'll need to make a lot more effort, and hopefully, I'll be successful the first time.
有些乐曲可能长达40分钟，需要多达50次翻页，其中包括为演奏重复乐章时的回翻。
Some pieces of music can go for 40 minutes and require up to 50 page turns, including back turns for repeat passages.
它们可以产生足够多的新病毒来训练免疫系统杀死并记住它们，所以人们只需要接种一次疫苗。
They can produce enough new viruses to train the immune system to kill and remember them, so people only need to take the vaccine once.
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