我的数学成绩总是班上最后一名。
我们实际上改变了地球大气层的化学成分。
We have literally altered the chemistry of our planet's atmosphere.
那名患者的血液化学成分受到了定时的监测。
许多食物因所含的化学成分和添加剂被怀疑有害健康。
Many foods are suspected of being detrimental to health because of the chemicals and additives they contain.
既然科学成本上涨快于通货膨胀，资助上的一些限制是必要的。
Since the costs of science were rising faster than inflation, some restriction on funding was necessary.
他的数学成绩在班上总是垫底。
它列出了所有重要的科学成就。
男生的物理和化学成绩比女生好。
你想提高你的物理和化学成绩吗？
三年后，他们的数学成绩名列前茅。
肥皂中的化学成分对我们有什么帮助？
每一种原料都有自己的化学成分和味道。
Those ingredients each have their own chemicals and their own flavors.
在他的教导下，我们的数学成绩总是全年级最高分。
We always got the highest marks in math in our grade with his teaching.
海洋科学家研究海洋的化学成分、气候模式、海底地貌以及许多其他领域。
Ocean scientists study the chemical make-up of the ocean, weather patterns, the geography of the ocean floor, and many other areas.
李和他的10个同学成立了一个志愿者小组，呼吁人们加入“光盘行动”。
Li, together with his 10 classmates made a volunteer group to call on people to join in The "Clean Your Plate Campaign".
哪怕像牙膏这种简单的东西也至少有三种化学成分来保持牙齿清洁。
Something as simple as toothpaste has at least three chemicals that keep your teeth clean.
如果一种变化不影响食物的化学成分，那我们便称之为物理变化。
If a change does not affect the food's chemical composition, we call it a physical change.
凯瑟琳和大卫穿着带有网站标志的 T 恤去学校，很快他们的数百名同学成为了该网站的用户。
Catherine and David wore T-shirts with the site logo to school and soon hundreds of their schoolmates became users of the site.
她知道她的化学成绩可能因此而下降。
She knew that her chemistry grade may take a dive as a result.
那么什么是数学教学成功的主要因素呢？
So what are the major contributing factors in the success of maths teaching?
结果显示，学生的数学成绩几乎没有提高。
当雨云移动时，降雨的化学成分略有变化。
The chemical composition of rainfall changes slightly as raid clouds move.
我们都知道居里夫人和她许多科学成就的故事。
We all know the story of Marie Curie and her many scientific achievements.
降雨的化学成分随着雨云的移动而发生轻微变化。
The chemical composition of rainfall changes slightly as rain clouds move.
日本的平均数学成绩记录明显好于英格兰和威尔士。
Japan has a significantly better record in terms of average mathematical attainment than England and Wales.
在阅读、写作和科学成就方面的差距应该进一步缩小。
There are gaps in reading, writing, and science achievement that should be narrower.
高中成绩或平均绩点是预测大学成绩最常用的两个指标。
Scores or their grade point averages in high school are the two measures most commonly used to predict college performance.
科学家们发现，第2组和第3组的学生的科学成绩有所提高。
Scientists found those in Groups 2 and 3 improved their science grades.
她说目前确认化学成分是否造成癌症的途径每次对其进行试验。
She says the current way to identify whether chemicals cause cancer is to test them one at a time.
在开放式大学成立后的30年里，人们得到了一条重要的经验。
In the 30 years since Open University was established, an important lesson has been learned by people.
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