1.沉重;冗长,沉闷;
2.重,沉重;冗长,呆板
1.The derivative of ponderous
1.the petty gain of instrument make it of costly ponderosity, deft glasses, more convenient, practical.
把昂贵粗笨的仪器做成便宜、轻巧的眼镜,更加方便、实用。