通常情况下，不愿花费晚上的时间练习拼写，学习乘法口诀的是孩子，不是家长。
Usually it is the children, not the parents, who are loath to spend their evenings practising spelling and learning times tables.
在有限域的基本运算中，乘法逆元的计算是最费时间的运算。
Among the basic arithmetic operations over finite fields, the computation of multiplicative inverse is the most time consuming operation.
当时我们正在飞机上，大约有两个小时的空闲时间。我本来估计过一遍乘法表可能需要20分钟。
We were on a plane and had about two hours to kill. I figured running through the twos to the twelves would take about 20 minutes.
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