介导疼痛的分子非常古老，揭示了这种感觉在进化中的深远根源。
The molecules that mediate pain are ancient, revealing how deeply rooted this sensation is in evolution.
科学的力量在于它的普遍性和客观性，它超越了文化和国界。
Democracy is not just voting, it's a way of life based on the respect of diversity and tolerance.
The severity of Russian laws is alleviated by the fact that it is not obligatory to execute them.
The past is always tense, the future perfect.
梦想是伟大的种子，但努力才是让它们成长的关键。