It is not clear to us what you meant我们不清楚您到底是怎么想的

今天的几个句子是有关反驳对方的：1.The one point that concerned us (a little) was... 使我们担心的一点是…… 2.We have become concerned with regards to the shipment schedule. 我们对装船的日程感到担心和挂念。