This is a hands-on workbook for parents and teachers, written for children from ages 3 to 12 years old, for use in the classroom or at home.
这是一本供家长和教师使用的实用练习手册，为3至12岁的儿童编写，可以在教室或家中使用。
This meant years of archival research and tracking down old and out-of-print books and trying to gather materials for lively profiles of people long dead and of weapons and tactics no longer in use.
这还意味着研究多年前的档案、收集旧书和绝版书籍、组织过世人现存的档案、以及研究已经不再使用的武器和战术。
Until now, the oldest evidence of stone-tool use was a haul of more than 2, 600 stone flakes estimated to be 2.5m years old that was discovered in another part of Ethiopia in 1997.
迄今为止，人类使用石器工具的最早证据是大约250万年前发现的超过2600多片的石头薄片，这是1997年在埃塞俄比亚的另一个地区发现的。
The practice then was to use a graduate as an assistant for seven to eight years. There were a lot of old-timers who were on the waiting list.
当时的常规做法是毕业生先当七八年的助手，另外还有一大批老资格的人等着当导演呢。
My son is three years old; he is learning to use the potty and brush his teeth at the moment.
我的儿子三岁了，眼下开始进行如厕和刷牙学习。
Until now, the oldest evidence of stone-tool use was a haul of more than 2,600 stone flakes estimated to be 2.5m years old that was discovered in another part of Ethiopia in 1997.
迄今为止，人类使用石器工具的最早证据是大约250万年前发现的超过2600多片的石头薄片，这是1997年在埃塞俄比亚的另一个地区发现的。
Particularly the central heating system is still in use 50 years of the 20th century old design.
特别是中央供热系统，目前仍然在使用20世纪50年代的老式设计。
Under the proposed re-programming, Pakistan could use the money to upgrade about 40 old-model F-16's in its Arsenal for several years.
根据提议中的重新分配计划，巴基斯坦可以使用这笔钱来更新已在武库内若干年的大约40架老型号的F - 16型飞机。
We normally use this blog to publish up-to-the-minute stuff, and this article is actually four years old, but we won't make a habit of it.
我们一般使用这一博客发布最新消息，而且事实上这篇文章是写于四年前，但是这次翻出来只是特殊情况。
Fourteen years ago, when Netflix was only a few months old, I needed to choose a codename — something to use for our test site, our email and our legal documents.
14年前，当时网飞公司刚刚诞生几个月，我需要为我们的网站、电子邮件和法律文件等选择一个研发代号。
If your firm is less than three years old and under $1 million in revenues, you can use Microsoft's software without charge under its BizSpark program.
如果你的公司成立不到三年，且营业收入低于100万美元，你就可以通过微软的BizSpark项目免费使用。
I was 20 years old when the "iconic," and I use this term loosely, show started, and twenty-six when it ended.
当这部“标志性的”——我就是随口一说——电视剧开播的时候我20岁，它结束时我26岁。
Some products may be designed or intended for use by consumers of all ages, including children 12 years old or younger, but are intended mainly for consumers older than 12 years of age.
有些产品可以被设计或预期供所有年龄的消费者使用，包括儿童12岁或更加年轻的，但是主要预期是为了大于12岁的消费者。
The old version business licenses of individual businesses already used shall be replaced after four years of use.
已使用的旧版个体工商户营业执照待使用期满四年后换发。
First, I only use lenses that are over a hundred years old. In those times they hadn't invented the ho film coating technology.
第一，我用的镜头全都是一百年前的老镜头，那个时候还没有发明我们讲的HO镀膜技术。
In general, the researchers found, as Internet use climbed, so did BMI, particularly among girls younger than 18 years old.
研究人员发现，一般而言，体重指数随着上网时间的增加而增加，特别是年龄小于18岁的女孩。
Bridge crane in use after period of time, can appear different degree of cart walk chew rail phenomena, especially used for many years of old bridge crane.
桥式起重机在使用一段时间后，会出现不同程度的大车行走啃轨现象，尤其是使用多年的陈旧桥式起重机。
A few years later, old Jehan Daas lost the use of his limbs on account of rheumatism.
几年后，老耶汉·达斯因患风湿症而四肢瘫痪。
I may have to use parts form other years but I'll try and keep those as old as possible.
我可能要使用的零件形状其他年份，但我会尝试，并把这些作为老越好。
In recent years, more and more new drugs and old drugs which changed their use or forms are put in clinical practice.
近年来不断有新药及改变剂型或用途的老药投入临床使用。
The Naxi language is the only hieroglyphic language still in use and is over 1,000 years old.
纳西语是唯一仍在使用的象形文字， 已有一千多年的历史了。
To make good use of life one should have in youth the experience of advanced years, and in old age the vigor of youth.
青年而有老年之经验，老年而有青年之朝气，就能使人生发挥更大的作用。
To make good use of life, one should have in youth the experience of advanced years, and in old age the vigor of youth.
青年而有老年之经验，老年而有青年之朝气，就能使人生发挥更大的作用。
Toy: product intended for use by children under 14 years old for playing purposes.
玩具：供14岁以下儿童使用，用于玩耍用途的产品。
Product designed or clearly intended for use in play by children under 14 years old.
设计或明显地供14岁以下儿童玩耍的产品。
The FDA notes that the new heparin has been available since October 2009 and there will be supplies of both the old and new heparin stocked for use in hospitals and pharmacies for about three years.
FDA提示，新的肝素制剂已从2009年10月开始上市，并且在医院和药店同时供应新旧两种肝素制剂的情况将持续约3年。
The FDA notes that the new heparin has been available since October 2009 and there will be supplies of both the old and new heparin stocked for use in hospitals and pharmacies for about three years.
FDA提示，新的肝素制剂已从2009年10月开始上市，并且在医院和药店同时供应新旧两种肝素制剂的情况将持续约3年。
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