rarefaction词汇搭配

Noun:

1. a decrease in the density of something;

   "a sound wave causes periodic rarefactions in its medium"
   

rare old异乎寻常的, 极度的rareadj.罕见的；珍贵的；煎得嫩的Rare copper plating gold Kwan-yin收来罕见的铜镀金观音rare-earth ores with the scandium含钪稀土矿rare-earth oxide-coated cathode稀土金属氧化物阴极rare earth luminescent microspheres稀土发光微球rare earth-magnesium middle alloy稀土镁中间合金rare earth metal conversion coatings稀土转化膜rare earth fluorescent tracing plane稀土荧光示踪板Rare earth Mg-Si-Fe modification稀土硅镁铁合金变质处理rare and endangered medicinal plants珍稀濒危药用植物Rare earth trifluoromethanesulfonate三氟甲磺酸稀土