She is a very good and experienced rider.

她是一位经验丰富的优秀骑师。

As we came out of the stables, a rider came towards us.

当我们走出马厩的时候，一个人骑着马向我们走了过来。

Mr Casey said he could see no necessity to add any rider on the use of firearms by police. [+ on]

凯西先生说他觉得没有必要增加任何有关警察使用枪支的附加条款。

America conventionally attaches a rider to Israeli aid, to the effect that it must not be used in the occupied territories. [+ to]

美国按照惯例在对以色列的援助中提出了附加条款，大意是该援助不能用于被占领地区。