Here is where the vital exchange occurs.

这就是键的交换之地。

That is when the greatest progress occurs.

这正是最伟大的进步来的时刻。

The irony is just occurring to me.

我也是刚意识到这件事有多讽刺。

There's so much material that a traffic jam occurs.

物质太多，都发生拥堵了。

Two months later, something, something incredible occurs.

两个月后，难以置信的事情发生了。

Typically fatigue occurs in the later weeks of treatment.

疲惫的感觉通常会在治疗后期出现。

Growing evidence supports inflammation as the foundation upon which disease occurs in our body.

越来越多的证据表明炎症是我们身体疾发生的基础。

Radford and his colleagues wanted to investigate how that learning occurs.

拉德福德和同事想研究这种学习的发生过程。

There are a lot of theories as to why that occurs.

为什么会发生这种情况，有很多理论。

So you can get out ahead of potential deforestation before it occurs.

你就可以在潜在的森林砍伐发生前采取行动。”

Most volcanic activity occurs where these plates collide.

大多数火山活动发生在这些板块碰撞的地方。

Sometimes the clot might dissolve on its own before permanent damage occurs.

有时，血块可能会在引起永久性损害之前自行溶解。

Answer choice B. the presence of complex systems contradicts how evolution occurs.

B 选项说复杂系统的存在与进化发生的过程相矛盾。

Then comes the chlorophyll-rich palisade mesophyll, where the bulk of photosynthesis occurs.

然后是富含叶绿素的掌状中叶，大部分的光合作用在这里发生。

Most influenza deaths occur in developing countries and very few vaccinations occur there.

大多数流感死亡发生在发展中国家，但那里的居民很少接种疫苗。

Using the Ebird models combined with satellite data predicting where water naturally occurs.

使用 EBird 模型与卫星数据相结合，预测哪里会有自然降水。

There are three main ways by which heat transfer occurs, conduction, convection and radiation.

传导、对流和辐射。

But the surface inside the leaves where diffusion actually occurs is 6000 square meters.

但是实际上发生扩散的叶片内部表面为6000平方米。

Thus avoiding accidents that otherwise might have occurred.

从而避免可能会发生的事故。

Like that just wouldn't occur to them.

就像他们不会想到的那样。