1. This was a tough assignment for them. 这是一个困难的任务为他们。
2. It was a tough choice. 这是一个棘手的选择。
3. This is a tough task. 这是一项棘手的任务。
英英解释
n.
1. someone who learned to fight in the streets rather than being formally trained in the sport of boxin
2. an aggressive and violent young criminal
3. a cruel and brutal fellow adj.
1. not given to gentleness or sentimentality
2. very difficult; severely testing stamina or resolution
3. physically toughened
4. substantially made or constructed
5. violent and lawless
6. feeling physical discomfort or pain (`tough' is occasionally used colloquially for `bad')
7. resistant to cutting or chewing
8. unfortunate or hard to bear
9. making great mental demands; hard to comprehend or solve or believe