heavy sky阴天heavyadj.大(量)的；重的；沉重的；猛烈的heavy metals contaminations重金属污染heavy calibre drill rod pipe大口径钻杆管heavy-medium coal dressing重介质选煤heavy saline-alkaline soil重盐碱地heavy ion elastic scattering重离子弹性散射Heavy land transport vehicle重型陆地运输工具heavy antiaircraft artillery重型高射炮heavy duty diesel engine oil重负荷柴油机油heavy section H-beam steelheavy-cargo transportation大件运输