在采矿业，可持续性不仅仅是一个流行词，而是长期成功的必要条件。
The obligation of subjects to the sovereign is understood to last as long, and no longer, than the power lasteth by which he is able to protect them.
You know, I'm not always going to be around to help you...
Patience is key in observational astronomy—some discoveries take decades to confirm.
Economic history teaches us that change is possible, but it is rarely easy.