topsoil

n. 表层土

top-up, topaz, topcoat, topi, topiary, topic, topical, topicality, topically, topknot, topless, topmost, topographical, topographically, topography, topper, topping, topple, tops, topside, topsy-turvy, tor, torch, torchlight, tore, toreador, torment, tormentor, torn, tornado, torpedo, torpedo-boat, torpid, torpidity, torpidly, torpor, torque, torrent, torrential, torrents,