gerardus 基本例句 格拉尔杜斯 Gerardus Mercator’s projection, published in1569, was immediately useful because it depicts a line of constant bearing as a straight line, which is handy for marine navigation. 福西厄斯•墨卡托的投影于1569年问世，马上就派上了用场，因为它把不变的方位描绘为直线，这对航海非常方便。 ecocn