It's hours two and three that get tough.
后面两三个小时才是真功夫。
Cassandra has had a tough assignment during the past three decades.
预言之神在过去的30年里任务很重。
And, in the end, is a three-month trek really all that tough?
归根到底，一场历时三个月的徒步真的那么艰难吗？
It took us three days to accomplish this tough task.
我们花了三天时间才完成这项艰苦的任务。
It took us three days to finish this tough task.
我们花了三天的时间来完成这个艰苦的任务。
It took us three days to finish this tough task.
我们花了三天的时间来完成这个艰苦的任务。
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