Wolf spiders hunt mainly by sight.

Method: The oil was refined from Harp Seal and analyzed by gas chromatography.

方法：以精制海狗油为原料，采用毛细管色谱柱进行分离，用归一化法计算含量。

The Primary Study on Kinetic Process of Harp Seal Oil in Rats with Liquid Chromatography and Mass Spectrometry

海狗油大鼠体内药物动力学初步研究

Study of Fatty Acids in Harp Seal Oil by GC-MS

GC/MS法分析研究海狗油中的脂肪酸组成

A young harp seal tests the frigid waters in Canada's Gulf of St.

一只年轻的海豹试探着加拿大海湾圣劳伦斯那冰冷的海水.

A baby harp seal rests on the Arctic ice.

一只幼格陵兰海豹在北极冰面上休息.

African elephants, unlike their Asian relatives, are not easily domesticated.

同它们的亚洲亲属不同，非洲象很难驯化。

Every year, 25000-30000 African Elephants are poached to supply the ivory trade.

每年都有25000到30000只非洲大象因供应象牙贸易而被猎杀。

What's the difference between Asian elephants and African elephants?

亚洲象与非洲象有什么不同？

As Asian elephant herds dwindle, African elephants have become the only source of ivory.

随着亚洲象群日渐减少，非洲大象成了象牙的唯一来源。

In the way of sheer weight, African elephants take the cake.

假如用举起自身重量来衡量力量的大小，那么非洲象能够拔得头筹。

Captions will usually tell you where the data came from ( for example, a scientific study of 400 African elephants from 1980 to 2005).

标题通常会告诉你数据的来源（例如,1980年至2005年关于400头非洲象的科学研究）。

African elephants have bigger ears.

非洲象的耳朵比较大。

When snow started falling this week, the line of shivering delegates waiting outside looked like emperor penguins hunched tightly against each other amid an Antarctic storm.

本周，当雪花开始飞舞，打着寒战在门外排队的代表们，看起来就像是在南极风暴中相互紧紧依靠的帝企鹅。

Emperor penguins huddled together against the cold are using coordinated waves of movement to stay tightly packed together.

帝企鹅们挤在一起，通过用协调的摇摆动作紧挨在一块来抵抗寒冷的环境。

These Emperor Penguins are near the end of a two-week fishing marathon,

这些企鹅们正处在为期两周的捕鱼马拉松的结尾，

Emperor penguins are the world's largest penguins.

帝企鹅是全球最大的企鹅。

Climate change is threatening the sea ice environment of Emperor penguins.

气候变化严重威胁到帝企鹅的海冰环境。

The list included most of the things Liu loves; watching TV, playing computer games, going shopping, chatting with his deskmate during the class and even skipping classes.

这张单子上的大多数事情都是刘喜欢的：看电视，玩电脑游戏，逛街，上课和同桌讲话，逃课等。

My deskmate skates well.

我的同桌滑冰滑得很好。

A design calculation of bolting between threshing cylinder and rasp bar

脱粒滚筒与纹杆间螺栓联接的设计计算