a. 引出的；萃取的

v remove, usually with some force or effort; also used in an abstract sense

v get despite difficulties or obstacles

v deduce (a principle) or construe (a meaning)

v extract by the process of distillation

v separate (a metal) from an ore

v obtain from a substance, as by mechanical action

v take out of a literary work in order to cite or copy

v calculate the root of a number