有待于
5.Rational knowledge depends upon perceptual knowledge and perceptual knowledge remains to be developed into rational knowledge -- this is the dialectical-materialist theory of knowledge.
6.The second point is that knowledge needs to be deepened, that the perceptual stage of knowledge needs to be developed to the rational stage -- this is the dialectics of the theory of knowledge.
8.The source of meteors traveling through space has yet to be explained satisfactorily.
9.The problem of how the message was to be sent to them still remained to be solved .
10.It is set forth that the limit value of lateral deflection is remained to be discussed further.

