进行测试是一个复杂的问题，需要有长期的经验才能掌握。
Testing is a complicated problem and long experience is required for its mastery.
一项长期的客户大约是掌握自己的业务，以一个竞争对手。
A long-term client was about to take their business to a competitor.
所有掌握权力的人员都不会对怎样运用权力长期茫然不解。
No one who possessed power was long at a loss how to use it.
所有掌握权力的人员都不会对怎样运用权力长期茫然不解。
No one who possessed power was long at a loss how to use it.
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