pond scum造句

It is this lurking sense of inferiority that makes us lust for success, consider ourselves pond scum, or both.

Hence ExxonMobil's $600 million research foray into car fuel made from pond scum, and Shell's decision to freeze all other investment in renewables to focus on biofuels.

This is a sea dragon, and the one on the bottom, the blue one, is a juvenile that has not yet swallowed the acid, has not yet taken in the brown-green algae pond scum into its body to give it energy.