Shells she sells on the seashore are seashells I am sure.
我敢肯定她在海边卖的贝壳是海贝。
It is our permanent principle that contracts are honored and commercial integrity is maintained.
重合同、守信用是我们的一贯原则。
and near its lower reaches there is a long tailing-off which is almost certainly the result of material transported out to deep water after being eroded from the continental masses.