两次的英文：
twice

semimonthly.See Usage Note at bi -
一月两次的参见

Twice weekly I go swimming
每星期我去游泳两次。

At match point, she served a double fault.
她在决胜点两次发球失误。

The time at which the two reductive divisions occur is not necessarily coincident to the time of ovulation.
两次减数分裂的时间不一定与排卵时间相一致。

He had proposed marriage unsuccessfully, twice already.
他已两次求婚，均未成功。

You took time out two times today.
今天你已经休息过两次了。

If you cube 3,the result is 27.
如果把3自乘两次，得数为27。

Form the habit of brushing your teeth twice a day.
养成每天刷两次牙的习惯。

The tropical year is the interval between two transits of the mean Sun through the mean equinox.
回归年是平太阳两次通过平春分点的时间间隔。

The ticket allows you two stopovers between London and Tokyo.
此票允许在伦敦到东京途中逗留两次。

Once bitten, twice shy.
一朝被咬，加倍小心。

Once a man and twice a child
一次为成人,两度当小孩

She has a help in twice a week.
她雇了一个女佣,一周来做两次。

They had to fight with a force twice their numbers
他们必须与人数两倍于他们的军队作战。

It grows twice as fast as the second colony.
它增长的速率是第二个群体的两倍。