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 .
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 .
