All human actions have one or more of these seven causes: chance, nature, compulsion, habit, reason, passion, and desire.
所有人类行为都有以下七个原因中的一个或多个：机会、自然、强迫、习惯、理性、激情和欲望。
煤炭的未来在于清洁高效利用。
The sun, with all those planets revolving around it and dependent on it, can still ripen a bunch of grapes as if it had nothing else in the universe to do.
The desire to get rich is a natural human instinct, and it's not something to be ashamed of.