短语词组短语a big mass of 一大片a dense mass of 黑压压a jumbled mass of reeds 乱蓬蓬的茅草A Round Mass Of Food 丸子a solid mass of earth 一大块泥土a compact mass of sand 坚实的沙堆a tangled mass of hair 一团乱发a large mass of rock 一大块岩石 返回 a mass of