English is a very important language in today's world.
英语是当今世界上一种非常重要的语言。
If a high hill stood between A and B, it was important to decide whether the line should climb over it, pierce it with a tunnel, or make a detour to avoid it.
假設 A 和 B 之間有一座高山,那就要考慮一下,路線應該越過高山、穿過高山,還是直接從山旁繞過呢?