When light comes in, some bounces off the top surface.

在光线进入时，有一些从顶部表面反弹。

The top surface of the dried gum is not subject to local or national laws.

干掉的口香糖不受当地或国家法律的约束。

So this little real mark on top, kind of like depending on how wet the -- the top surface was.

上面的这个图案有点取决于顶部表面有多湿。

While most of the packet is made from plastic, the top surface is made from aluminium foil.

虽然大部分包装由塑料制成， 但顶面由铝箔制成。

But to help absorb sugars, there are special enzymes, on the top surface or brush border of the intestinal cells, called brush border enzymes.

但糖类的吸收需要一类特殊的酶来协助；这类酶分布于小肠细胞的顶端，即小肠粘膜刷状缘；这类酶也因此称为刷状缘酶。

The trace marks themselves are very shallow, and show that the animal was scraping away the top surface of the seafloor to eat.

痕迹本身很浅，表明该动物正在刮掉海底的顶面以进食。

Now, one of the more interesting patterns that we see in the animal is that it's got a lighter underside compared to the top surface.

我们在这只动物身上还看到了更有趣的图案，即相比于顶部，该动物的底部颜色更浅。

It is on this fan that is in Jezero Crater, and we've now climbed up on top of this fan and are exploring the sedimentary rocks on the top surface of the fan.

它在耶泽罗陨石坑的扇形上，我们现在爬上了这个扇形的顶部，正在探索其上的沉积岩。

This stone demonstrates sharp versus soft, my terms, but it happens to have split so that the top surface here, is rounded, and the other side has a very sharp transition from the face to the side.

在我看来，这块石头展示了锋利和柔软，但它碰巧裂开了，所以这里的顶面是圆形的，另一边从正面到侧面有一个非常尖锐的过渡。