The past is always tense, the future perfect.
培养感恩之心是提高生活满意度最可靠的方法之一。
The double helix structure of DNA is not only beautiful but also elegantly simple.
Habit is habit, and not to be flung out of the window by any man, but coaxed downstairs a step at a time.
滚动的弹丸,掉落到凹陷之处,便不再滚动了;流传的谣言,到智慧的人那里,便不再流传了。