使用简短的，主动态的句子。
（现在完成时主动态）从那时以来，我们保持联系已有相当长的时间了。
Since then we have kept in contact with each other for quite a long time.
他对此一无所知，没有人跟他商讨过这样计划。(加上“人”变主动态)。
He had no knowledge of this and had not been consulted on these plans.
目的研究主动脉弓动态图像测量的方法。
Objective to research a dynamic image measurement approach to aortic arch.
目的研究主动脉弓动态图像测量的方法。
Objective to research a dynamic image measurement approach to aortic arch.
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