find, hear, see, have, succeed, learn, get_onto, know, have learned of

Low carbon

don, guide of a great cause, hierophant, teacher, tutor, imam, supervisor, leader in a cause, preceptor, professor, preceptorship, adviser, teacher in charge of class, mentor, counselor

adj. 真正的，标准的 real, pure, up to standard

tract, area, latitude, quarter, territory, climate, region, scope, district, terrain, climactic

形成地球外壳的成分和结构