Walk must be very tiring 步行肯定很令人疲惫
Mountain climbing can be very tiring, so Colin and I will make sure that we get plenty of rest.
爬山会很累，所以我和科林会确保我们得到充足的休息。
How was the trip. It must be very tiring, flying for more than ten hours.
一路可好？十几个小时的飞机很辛苦啊。
Traveling by plane is exciting, but it can also be very tiring. There are so many things to be done.
搭乘飞机旅行很刺激，但也可能很累人，因为有一大堆事情要办。
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