17岁的时候，他开始了他的第三次旅行。这一次，他去了北太平洋，并绘制了北美西海岸的地图。
He began his third trip in 17. This time he went to the North Pacific and made maps of the west coast of North America.
他注定要在北美西海岸的某个地方登陆了。
He was bound to land somewhere on the western coast of the North American continent.
这个板块从北美西海岸一直延伸到大西洋中部。
This plate extends from the west coast of North America to the middle of the Atlantic Ocean.
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