The cocoon-to-butterfly theory only works on cocoons and butterflies.

茧变蝴蝶理论只适用于茧和蝴蝶。

I may be so because there is some kind of power that spurs me—just as the silkworm is spurred to make its cocoons.

我之所以如此是因为有某种力量在鞭策着我——正如蚕被鞭策着去结它的茧子一般。

The silkworms have gone into the bushes to spin their cocoons.

蚕上山了。

First cocoons are made into silk.

首先把蚕茧变成了丝。

It is made from silkworm cocoons.

它是由蚕茧制成的。