单词ponderosity
n.: 沉重;冗长;呆板网络: 笨拙;笨重;极重
重,沉重;冗长,呆板
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。