然而，曹发现石墨烯有时会发生变化。
例如，当我们烧木头或煮鱼时，材料会发生变化。
For example, when we burn wood or cook fish, materials change.
这可能意味着地面上的天气也可能很快发生变化。
This may mean that the weather on the ground may soon change, too.
当土地被开发为人类使用时，其地貌就会发生变化。
When land gets developed for human use, the landscape changes.
相反，发生变化的是在成年早期采用不同生活方式的相对比例。
What has changed, instead, is the relative share adopting different ways of living in early adult-hood.
在一项精准扶贫项目引入村里后，她的家庭生活开始发生变化。
The life of her family began to change after a targeted poverty relief project was introduced to the village.
天气不可预测，土壤质量发生变化，害虫和疾病随时都可能出现。
There's unpredictable weather, changes in soil quality, and the ever-present possibility that pests and diseases may pay a visit.
然而，在新千年伊始，资源规划者对水资源的看法开始发生变化。
At the outset of the new millennium, however, the way resource planners think about water is beginning to change.
你也不能让它变得更好，因为化学物质一旦发生变化，是不可逆的。
You can't make it better, either, because once chemicals change, they can't be changed back again.
她说，与篮球队服不同的是，军装的长度已经很久没有发生变化了。
She says that, unlike those for basketball, the length of military uniforms has not changed for some time.
而且，一旦种群或环境发生变化，智商测试就不一定预测得那么准确。
Moreover, IQ tests do not necessarily predict so well once populations or situations change.
然而，当火山物质在喷发过程中积累并随后崩塌时，它的高度经常发生变化。
However, its height often changes when volcanic material accumulates during eruptions and subsequently collapses.
在男性中，峰值似乎存在于大脑“程序”发生变化的时候，比如上下班期间。
Among men, the peak seems to be when a changeover in brain 'programs' occurs, as for instance between going to and from work.
在火山爆发与随后的崩塌过程中，火山物质不断积累，它的高度经常发生变化。
Its height often changes when volcanic material accumulates during eruptions and subsequently collapses.
建筑形态学是研究不断变化的文化和环境条件如何使建筑形式发生变化的学科。
Architectural morphology is the study of how shifting cultural and environmental conditions produce changes in an architectural form.
地球气候发生变化，部分地区的降雨变得更加难以预测，所以这些答案将变得更有价值。
As the earth's climate changes and rainfall becomes even less predictable in some places, those answers will grow even more valuable.
越来越多的证据表明，响应气候的变化，世界许多地区的滑坡发生的频率和程度正在发生变化。
There is mounting evidence that the frequency and magnitude of landsliding is changing in many parts of the world in response to climate change.
世界经济论坛的研究发现，到2022年，工作岗位中平均42%的“核心技能”将会发生变化。
Research by the World Economic Forum finds that on average 42 per cent of the "core skills" within job roles will change by 2022.
重要的是要承认，决定亲子关系的因素已经发生变化，以避免这种关系退回到青少年时期的模式。
It's important to acknowledge that the relationship parameters have changed to avoid falling back into patterns from the teen years.
气候变化将加速某些地区浮游植物的生长，同时减少其他地区的浮游植物，导致海洋的外观发生变化。
Climate change will fuel the growth of phytoplankton in some areas, while reducing it in other spots, leading to changes in the ocean's appearance.
虽然政府长期投资的承诺可能已经发生变化，但对更多经济适用房的迫切需求是真实存在且不会消失的。
While the government's commitment to long-term funding may have changed, the very pressing need for more affordable housing is real and is not going away.
当市场和世界形势发生变化时，我们正在做的事情就会变得没有意义，这时候我们也会面临那样的难题。
We're going to have questions like that where we have things we're doing that don't make sense when the market changes and the world changes.
猿猴的肩膀有利于其在吊在树上，但是当我们的祖先开始以两条腿走路以后，猿猴的肩膀也开始发生变化。
The ape shoulder is good for hanging from a tree, but when our ancestors started walking on two legs, the shoulder started to change.
但当市场和世界形势发生变化时，我们正在做的事情就会变得没有意义，这时候我们也会面临那样的难题。
But we're going to have questions like that where we have things we're doing that don't make sense when the market changes and the world changes.
一项对九年级学生的研究发现，在九年级学生中，50%的友谊每个月都会发生变化，这表明友谊极其不稳定。
One study of ninth-grade students found that 50 percent of friendships among ninth graders changed from one month to the next, signaling striking instability in friendships.
你每在英语课上学一个新单词，每解决一个数学问题，每学会唱一首新歌，你大脑中的神经元网络就会生长，大脑就会发生变化。
For every new word you learn in your English lesson, every problem you solve in maths, every new song you learn to sing, a neuronal network grows in your brain and the brain changes.
例如，对动物的研究表明，老鼠在怀孕期间经历压力会导致胎儿表观遗传发生变化，进而导致啮齿动物在成长过程中出现行为问题。
Studies of animals, for example, have shown that when a rat experiences stress during pregnancy, it can cause epigenetic changes in a fetus that lead to behavioral problems as the rodent grows up.
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