她们的母亲和老祖母也许是过分拘谨了点儿.Their mothers and grandmothers were perhaps a little more deliberate.我的老祖母过去总是用花边给她的桌布镶边.My old granny always used to edge her table - cloths with lace.“ 当然了, 那你可以选一样我的东西,你觉得比雀斑漂亮的. ” 老祖母说." Of course...
在开始使用前把氢氧化钾电介质压入蓄电池.The potassium hydroxide electrolyte is forced into the cells just before use.在电介质的其余部分,单位体积的静电荷仍为零.Within the remainder of the dielectric the net charge per unit volume remains zero.样品在辐照前后,电介质特性发生了变化...