cycling的时态
cycling是cycle的现在分词，表示正在进行的动作。
cycle
n. 循环，周期;自行车;时代，一段时间;整套
vi. 周而复始，循环;骑自行车;轮转
vt. 运转，循环;使轮转
第三人称单数 cycles
复数 cycles
过去式 cycled
过去分词 cycled
Cycling is a cheap way to get around.
骑自行车是一种省钱的旅游方式。
Cycling is Europe\'s second most popular sport.
骑自行车是欧洲第二流行的体育运动。
We did about 30 miles a day on our cycling trip.
我们骑车旅行，每天约骑30英里。
She was hot and breathless from the exertion of cycling uphill.
她骑车上山累得全身发热，喘不过气来。
More people would be attracted to cycling if conditions were right.
如果天气适宜，会有更多的人被吸引到骑自行车的行列中来。