Up till 500 years ago, our ancestors still led advancements in fields of metallurgy, economics, mathematics, nautical navigation, ceramics and silk.

直至500多年前，我们的祖先还在冶炼、经济、数学、航海、陶瓷、丝织等诸多方面引领着这个世界。

youdao

In normal coastal navigation, positions should be fixed every 15 minutes and plotted on the nautical chart.

正常沿岸航行应15分钟确定一次船位并在海图上划出。

youdao

In normal coastal navigation, positions should be fixed every 15 minutes and plotted on the nautical chart.

正常沿岸航行应15分钟确定一次船位并在海图上划出。

youdao