（）refers to the depth of a vessel below the waterline，measured vertically to the lowest part of the hull，propellers or other reference points.
举一反三
- ______ refers to the depth of a vessel below the waterline ， measured vertically to the lowest part of the hull ， propellers or other reference points ．
- We each _____ strong points and each of us on the other hand _____ weak points.
- In the simple two-part formula, it is obvious that one part is __________ and the other part refers to __________.
- Landmarks are points of reference and help the other person understand where to find you.
- The lowest temperature is twenty below zero.