The unique feature of this book is its down-to-earth practicality.
这本书所独有的特点就是其讲求实际的实用性。
But this amazing gift had its down-side. He found it difficult to ignore insignificant events.
但是这个令人惊奇的天赋也有它不好的一面，他发现他对于一些无关紧要的事情也不能忽略掉。
The hyperbolic surface, which has so-called negative curvature because its surface curves up and down at the same time, like a saddle.
双曲曲面，即通常所称的负曲率，因为它的表面同时向上和向下弯曲，就像一个马鞍。
The painting started to drop down in its frame and was shredded by some blades hidden in the bottom of the frame.
那幅画从框中脱落掉下来，被藏在画框底部的刀片切成了碎片。
Just as he was losing consciousness, he heard a faint squeak and looked down to see a baby wallaby that had fallen from its mother's pouch.
就在他即将失去知觉时，他听见微弱的叫声，循声看去，他看见一只小袋鼠从妈妈的育儿袋掉下来。
The structure of the backbone shows, however, that Ambulocetus swam like modern whales by moving the rear portion of its body up and down, even though a fluke was missing.
不过，走鲸的脊椎结构显示，即使没有尾片，它们在水中同样能够像现代鲸鱼那样通过身体后面部分的上下摆动来游动。
When the front bird moves its wings up and down, the resulting force of the air lifts the next one.
当前面的鸟上下移动它的翅膀时，产生的空气力会带动下一只鸟。
Over the past few months, it has been working hard, with the help of media consultants, to play down its cosy reputation in favour of something more academic and serious.
在过去的几个月里，在媒体顾问的帮助下，它一直在努力工作，以淡化其轻松愉快的印象，打造更学术化、更严肃的形象。
The sun, is also variable over a long term: its heat output goes up and down in cycles, the latest trend being downward.
太阳在长期内也是变化的：它的热量输出在周期中有上升，也有下降，最近的趋势是下降。
The avalanche forced its way down the mountain, crushing everything in its path.
雪崩冲下山来，摧毁了沿途的一切。
The horse reared, throwing its rider and knocking down a youth standing beside it.
这匹马向后一仰，摔下骑手并撞倒站在它旁边的一个年轻人。
Over time, the protein in the eggshell breaks down into its constituent amino acids.
随着时间的推移,蛋壳中的蛋白质分解成其构成成分氨基酸。
The company closed down operations and began liquidating its assets in January.
这家公司在1月份停止运作，开始把其资产折换成现金。
The Fair Trade Commission has of late been flexing its muscles, cracking down on cases of corruption.
公平交易委员会最近一展雄威，对腐败案件进行了严惩。
There is no cure for the disease, although drugs can slow down its rate of development.
这种病没法治，尽管药物可以延缓病情的发展。
He wanted to explore its borders, but concluded that it would be best to sit down and rest awhile, first.
他想要探索它的边界，但转而决定最好还是先坐下来休息一会儿最好。
We would say that this whole area over which it migrates is its habitat because on this long-distance journey, it needs to come down to feed and sleep every so often, right?
我们会认为它迁徙的整个区域就是它的栖息地，因为在长途旅行中，它需要经常下来进食和睡觉，对吧？
The Eaglet bent down its head to hide a smile: some of the other birds tittered audibly.
小鹰低下头，藏住笑容：其他鸟都笑出声来。
Involuntary part-time employment is still far higher than before the recession, but it is down by 640,000 (7.9 percent) from its year-ago level.
非自愿兼职的员工人数仍远高于经济衰退前的人数，但较上年同期减少了64万人，下降了7.9%。
When it grunted again, so violently, that she looked down into its face in some alarm.
当它又猛烈地咕噜了一声时，她惊恐地低头看了看它的脸。
The car mistakenly thought that the laser beam was in its way and slowed down or changed the direction.
汽车误以为激光束挡住了它的路，于是减速或改变了方向。
This is a huge advantage for the snowshoe hare since, by contrast, the feet of its predators usually sink right down into the snow.
这是雪鞋兔的一个巨大的优势，因为相比之下，它的捕食者的脚通常会陷进雪里。
Instantly Tom answered it, and leading Becky by the hand, started groping down the corridor in its direction.
汤姆立刻回应，拉着贝基的手，在通道里朝声音传来的方向摸索着。
Like when you walk outside on a hot day, you perspire, and your body cools itself down, a classic example of how a mammal regulates its own body temperature.
比如，当你在炎热的天气在户外行走，你会出汗，你的身体会自我降温，这是哺乳动物如何调节自身体温的典型例子。
Perhaps because the Supreme Court later struck down the ruling, politicians and scholars have failed to recognize its effects.
也许是因为最高法院后来推翻了这项裁决，政客和学者们没有意识到它的影响。
It could also be broken down into its component parts—oxygen and hydrogen.
它也可以按照组成部分被分解——氧和氢。
A Tokay gecko hangs upside down in its terrarium at the Academy of Natural Sciences in Philadelphia, Pennsylvania.
宾夕法尼亚州费城自然科学院的养缸里，一只壁虎倒挂着。
Soon afterward, the Federal government drastically cut down its expenditures for this purpose and later abolished them, causing a sharp drop in the number of nursery schools in operation.
很快，联邦政府就彻底地切断了用于此类目的的开销，后来直接取消了这项开支，这导致了营业中的托儿所数量锐减。
Some two hundred eruptions have been recorded down through the centuries, but compared with other volcanoes, most of its eruptions have so far been fairly light in terms of death and destruction.
几个世纪以来，这座火山约有200次爆发的记录，但与其他火山相比，这座火山的爆发程度迄今为止都相当轻，造成的死亡和破坏较少。
Some two hundred eruptions have been recorded down through the centuries, but compared with other volcanoes, most of its eruptions have so far been fairly light in terms of death and destruction.
几个世纪以来，这座火山约有200次爆发的记录，但与其他火山相比，这座火山的爆发程度迄今为止都相当轻，造成的死亡和破坏较少。
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