密集的测试对孩子最有好处。即使他们的测试成绩不好，我们也能帮助他们改进，让他们体会进步的满足感。

“What’s best for kids is frequent testing, where even if they do badly, they can get help and improve and have the satisfaction of doing better, ” he said.

youdao

对于人类而言，视网膜由密集的光感棒体以及视椎体细胞组成。 棒体细胞在弱光条件下比椎体细胞更容易发挥作用，并且这些细胞也是在鲨鱼视网膜内发现的最常见的细胞类型。

Rods are able to function in much lower light than cones - and these were the most common cell types found in all of the sharks.

youdao

在中心部分分布着密集的强敏感视觉细胞，而在中心部分以外的区域，光感细胞的分布明显稀疏了许多。

At the center is a dense cluster of ultra-sensitive vision cells. Outside this central area, the cells rapidly become more sparse.

youdao

在中心部分分布着密集的强敏感视觉细胞，而在中心部分以外的区域，光感细胞的分布明显稀疏了许多。

At the center is a dense cluster of ultra-sensitive vision cells. Outside this central area, the cells rapidly become more sparse.

youdao