In biology, the whole is more than the sum of its parts.

I might be in love with you. I'm waiting until I'm sure to tell you, though.

释义：他强调空气密度对于物质形态的决定性作用，认为物质的形态和性质都受到空气密度的影响。

If you want to keep something precious, you have to lock it up and throw away the key.