图4 - 2就是目前实验室里的验电器样式.Figure 4 - 2 shows a present - day laboratory version of the electroscope.验电器的叶片慢慢张开.The leaves of the electroscope slowly diverge.图 4-2 就是目前实验室里的验电器样式.Figure 4 - 2 a present - day laboratory version...
“我无法赴约了，”她说，“那天是母亲节。”"I can't make it," she said. "That's Mother's Day."母亲节规定为纪念母亲的节日.Mother's Day is a day set aside to honor motherhood.每逢母亲节,他们的孩子们都要采集那种紫色的花朵.Every Mother's Day their kids gat...