Mr heeks , a student , used a macro camera to get in close and had to wait patiently for a windless day .

身为学生的赫克斯太太，用低倍放大摄影相机接近泡泡，还得耐心等待无风的一天。

Victorian britain was perhaps similar , and the smog of charles dickens 's london finds its counterpart in the murk that envelopes beijing on windless days and tears at your throat like sandpaper .

遥想维多利亚时代的英国颇有几分相似，查尔斯狄更斯笔下的雾气霾天的伦敦，如同阴暗笼罩下的京城，无风的日子，好似将你我的喉咙扯破，与砂纸无异。

But below a certain density , hair stops insulating and wicks heat off the body instead-helping the elephants get rid of an extra 20 percent of their body heat , especially on windless days .

但是当毛发的密度低于某个特定值时，毛发反而会停止隔热，将热量依靠毛细作用带走，从而帮助大象摆脱体内额外的20%的热量，尤其在无风的天气。