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Reeves says that the real situation could be much worse, as researchers could not obtain enough data on more than half of the world's cetacean species to properly classify their status.

李弗斯说现实情况可能更为糟糕，因为研究人员用以实测鲸鱼状况的数据采集还达不到全球鲸目类的一半以上。

Some methods, in particular addCallback and its cousins return self to allow for chaining calls.

还有一些方法，典型的就是addCallback及多个相关的函数族，都会返回函数本身，用以支持链式函数调用。

It is a string of character used to stop user accessing the file.

它是一组字串，用以阻止用者存取档案。

The text used a circular motion model with charged particle to explain the photoelectric effect.

文中还用以电荷群的作用力为向心力做圆周运动的带电粒子模型解释了光电效应。

Boxing Day (26 December) is so-called because it's a time when tradespeople receive a "Christmas Box"---some money in appreciation of the work they have carried out all year.

圣诞节次日之四被称作Boxing Day （12月26日）是因为在那天从事商业活动的人会收到一个"圣诞节盒子"---里面有一些钱，用以嘉奖他们全年的工作。

Boxing Day (26 December) is so-called because it's a time when tradespeople receive a 'Christmas Box'– some money in appreciation of the work they have carried out all year.

圣诞节次日之所以被称作Boxing Day（12月26日）是因为那一天从事商业活动的人会收到一个"圣诞节盒子"—里面有一些钱，用以嘉奖他们一年的工作。

Used to manufacture agent perfect yellow, direct brown, acid chrome yellow, etc.

在染料工业中用以制造媒介纯黄、直接棕3GN、酸性铬黄等。

Monomeric reference compounds having similar chromophore components were also prepared for photophysical comparison.

具有与高分子相同发光团的参考单体也被制备用以作为光物理性质的比较。

Chronicle of modern history indicates that wax and wane of great nation is consecutive and vicissitudinary process, which can be paraphrased as "powerful nations are to rise within a five hundred years".

一部世界近代史表明，大国崛起及兴衰更替是一个此伏彼起、连续不断的历史进程，所谓"五百年必有王者兴"，很能用以表述这一复杂进程。

In natural harmony with this choice of subject matter are the social sensibilities of the artist, who remains active today with the Cinque Gallery in Manhattan, which he helped found and which is devoted to showing the work of minority artists.

不仅如此，艺术家的社会敏感性也融入到他所选定的主题中，与之浑然天成。他迄今还活跃在曼哈顿的Cinque画廊里，那是在他帮助下创办的，专门用以展示少数民族艺术家的作品。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。