定义
(a) tough (problem, case): 困难的，麻烦的（问题，案例）
(a) tough (person): 坚强的，不屈不挠的；坚韧的（人）
(a) tough (material): 牢固的；强壮的，结实的（材料）
Pronunciation examples
UK: The environment is one of today's toughest problems.
US: Kevin is tough because he grew up in a tough neighborhood.
- "Bob the Brit : Alright, let me see those hands in the air, tough guy!"
- "They are trying to break me, Bruno, and I am afraid that despite my rugged, tough exterior, I may not last."
- "Oh, so as I was saying, it will be tough to find a room for tonight, but I'll see what I can do."
- "That's a tough one."
- "Tough! Tough!"
- "It was a tough competition, but Mr Oleré eventually outclassed his canine competitors by using his human brain to his advantage."
- "Tough son of a bitch."
- "But I've got to warn you, these are some pretty serious tough hombres back there..."
- "You will see that it is tough and hard to swallow."
