49. calculate， compute， estimate
calculate通常指用数学方法进行比较复杂，难度较大的精确计算。如：You can‘t expect a schoolboy to calculate distances in astronomy.
compute常指比较简单的运算。如：It was computed that two thirds of the students in the class passed the examination.
estimate估计，常指对数量、成本等事先进行判断或估计。如：Some farmers asked the weatherman to estimate next year‘s rainfall.
50. cheat， deceive， trick
cheat欺骗，常用词，主要指为了自己的利益欺骗人。
deceive表示隐瞒真相或以假相骗人。如：The boy deceived the teacher by lying.
trick哄骗，表示耍手段进行欺骗，强调在行骗时使用计策，有时也指并非出于恶意的欺骗。如：Tom cleverly tricked his mother into approval.
