n.水準(zhǔn)測量；成水平；矯正；平整
動詞level的現(xiàn)在分詞形式.
The preliminary computation is the same as that for ordinary levelling. 概算與普遍水準(zhǔn)測量相同。
復(fù)測水準(zhǔn),重復(fù)水準(zhǔn)測量
