Men take only their needs into consideration, never their abilities.
人们常只想到自己的需要，而没考虑自己的能力。
The only way to get to the top of the ladder is to climb it step by step.
We wish to discuss a structure for salt of deoxyribose nucleic acid. This structure has novel features which are of considerable biological interest.
人依靠自己的力量人才能生存,不依靠自己的力量人就不能生存。
The conjectures of the Langlands program are a challenge to the next generation of mathematicians.