impure
adj
1 (dated 旧) morally wrong, esp in one's sexual behaviour 道德败坏的; (尤指)淫猥的
impure thoughts, motives, actions 淫秽的想 法、 动机、 举动.
2 not clean; dirty or contaminated 不洁的; 肮脏的; 污染的.
3 not consisting of one substance,but mixed with another substance of poorer quality 不纯的; 有杂质的
impure metals 不纯的金属.
The currents of air that the walls of the ship direct upwards, as well as in the line of its course, are enough to give the great bird with its immense wings sufficient sustenance and progress.