经过几次尝试后，他技艺变得更加精湛，开始与来自世界各地的人下国际象棋。

Having tried several times, he became better and began to play chess with people from around the world.

youdao

在几次尝试后，他注意到了我的笑声。

After several attempts, he noticed my laughter and walked over to me.

youdao

要经过几次尝试和出错之后才能选好要使用的值。

Choosing the values to use involves some trial and error.

youdao