dustless的意思？

The dustless chalk is of good quality, go and get some more.这批无尘粉笔的质量不错, 再去买一些吧!The characteristics of dustless compouded lead salt stabilizer are good, and without dust poison.无尘复合铅盐稳定剂性能优良, 无粉尘毒害....

dustless的音标：dustless的英式发音音标为：['dʌstlɪs]dustless的美式发音音标为：['dʌstlɪs]...