The concept of law is essentially a matter of social fact.

心理健康的未来在于数字和传统方法的无缝整合。

Technology can be a powerful ally in ensuring sustainable fisheries, but only if used wisely.

The most sustainable tree is the one that's still standing.

解释：使用毒性大的药物治疗疾病时，病情十成中只能去掉六成就要停药，以免伤害正气。

That's the only trouble with being a dog...they never tell you anything…