水泥

I came in at 4 hours and 14 minutes — not a fast race by any experienced runner's standard, I know, but an excellent time for me.

我用时4小时14分－－以一个久经赛场的运动员的标准来衡量则不算快，这个我清楚，但对我来说却是个美好时刻。

How to choose a good method in simultaneous determination without separation is a problem worthy of discussion.

如何选择合适的方法进行不经分离的同时测定是一个值得探讨的问题。