to prep.对于;为了;(表示方向)到;向;(表示间接关系)给adv.(表示方向)去;(门)关上
详细释义
名词 reducer:
a substance capable of bringing about the reduction of another substance as it itself is oxidized; used in photography to lessen the density of a negative or print by oxidizing some of the loose silver
pipefitting that joins two pipes of different diameter