It is important to exercise your brain by completing puzzles or challenging the brain by reading a difficultclassic novel.
通过完成拼图游戏或读一部经典小说来挑战锻炼你的大脑是很重要的。
2
This can be frustrating because classic 4gls often use proprietary languages, protocols, and even databases, making integration and extension even more difficult.
这可能会令人沮丧，因为经典4gl通常使用专有语言、协议甚至数据库，使得集成和扩展更加困难。
3
Whatever its consequences for climate change, Copenhagen is but the most recent reminder that classic multilateralism is increasingly difficult to achieve.