然而我们却往往看不见这心酸的泪，看不见这关爱的心。

However, we often see these sad tears, can not see this love's heart.

youdao

然而，我们要知道，这里面还存在着很多我们看不见的结构和物质。

However, we must remember that there are structures and matter that we cannot see.

youdao

然而，我们要知道，这里面还存在着很多我们看不见的结构和物质。

However, we must remember that there are structures and matter that we cannot see.

youdao