That's easy enough to do with air, but water is a much denser medium.

在空气中很容易做到，但在水中这样密集的媒介中就难了。

youdao

That's easy enough to do with air, but water is a much denser medium.

在空气中很容易做到，但在水中这样密集的媒介中就难了。

youdao