莫逆之交

例句：

1. 1. He and his best friend are planning to go hiking in the mountains.
   他和最好的朋友计划去山里徒步。
2. 2. She has a best friend who is always there for her when she needs someone.
   她有一个最好的朋友，当她需要人的时候总是在她身边。
3. 3. They have known each other since childhood and are considered the best of friends.
   他们从小就认识彼此，被认为是最好的朋友。