形容词
中文翻译：坚硬的
同义词：
['stubborn', 'difficult', 'tough']
例句：
-
1. The old car is really tough to start.
这辆旧车真的很难启动。
-
2. She's tough on her kids, but she cares about them deeply.
她对她的孩子很严格，但她真的很关心他们。
-
3. The job was tough, but he did it with dedication.
这份工作很难，但他以奉献精神完成了它。