质子的质量几乎是电子的2,000倍。Protons are nearly 2000 times as heavy as electrons.自由基是一种具有未配对电子的分子碎体.A free radical is a molecular fragment having an unpaired electron.在物质中的贯穿能力,都是和电子的动能E有关的.Penetration in matter depends on the kine...
Adolescent suicide is rarely an impulsive reaction to immediate distress.青少年自杀很少是由于突然发生不幸而作出的冲动反应。He spent his adolescent years playing guitar in the church band.他在教堂的乐队里弹吉他，度过了他的青少年时期。A little adolescent rebellion is co...
Photo Gallery: Azurite crystals from Arizona seem to pulse with color.矿物的图片集.蓝铜矿的结晶来自亚利桑那州好像添加彩色.Azurite's brilliant color adds to its popularity in creating semiprecious stones.兰铜矿灿烂的色彩加上它的声望造成准宝石的宝石.Limited compan...