【解释】幸福不可强求，保持愉快的心情，更能感受到幸福；灾祸难以避免，消除怨恨他人的念头，就能远离灾祸。

Words are the wings of thought, and poetry is their highest flight.

物理学和数学之间的界限并不像人们想象的那么清晰。

Quality is the lifeline of an enterprise, and it should never be compromised.

Challenges in the oil sector are opportunities to innovate and grow.

无产阶级，现今社会的最下层，如果不炸毁构成官方社会的整个上层，就不能抬起头来，挺起胸来。