糟糕战略最常见的来源是无法做出选择。

The best way to learn mathematics is to do mathematics.

"La memoria es frágil, pero la literatura puede salvarla del olvido."

The boundary between inside and outside is not a line, but a gradient.

Certification schemes are the floor, not the ceiling of responsible forestry practice.

译文：这种无端的愁绪最让人痛苦!不要去倚靠那高高的栏杆，夕阳正缓缓沉落，烟雾笼罩的柳林让人见了肝肠寸断。

最伟大的文学作品是那些将美与实用结合的作品。