思慧有一次在学校的乘法速算测验中拿了第二，蔡美儿一个星期让她每晚做20道题，拿秒表计时。
When Sophia came in second on a multiplication speed test at school, Chua made her do 20 practice tests every night for a week, clocking her with a stopwatch.
构建一个计时的数学测验游戏，在该游戏中，玩家必须在指定时间内回答四道随机的数学习题。
Build a timed math quiz game, where the player must answer four random arithmetic problems within a specified time.
提出在流道设计时应最大限度地利用流道宽度方向的扩散，以免出口断面的有效面积过多地被旋涡挤占。
It is suggested that the diffusion in the horizontal direction of the conduit should be utilized to restrain the effect of the vortex.
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