v. 改正, 矫正( rectify的第三人称单数 ); 精馏

v math: determine the length of

v reduce to a fine, unmixed, or pure state; separate from extraneous matter or cleanse from impurities

v bring, lead, or force to abandon a wrong or evil course of life, conduct, and adopt a right one

v set straight or right

v make right or correct

v convert into direct current