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According to NASA, a total eclipse, when the moon passes between the earth and the sun, is only visible from a narrow strip - about 150 km wide - of the Earth's surface at any one time.
据美国宇航局所说,整个日食过程,即在月亮位于地球和太阳之间的时间内,也仅仅在地表一条约150公里宽的狭长地带的某一时刻可以观看到。
Ophir Chasma is a large west-northwest-trending trough about 62 miles, or 100 km, wide.
俄斐峡谷是一个宽约62英里,或100公里的,朝向西北偏西方向的大低谷。
On the average the continental shelf is about 70 km wide. One much of the Pacific Coast it is relatively narrows, only a few tens of kilometers across.
平均来说,大陆架约为70公里宽,在部分太平洋海岸其大陆架较窄,只有几十公里宽。
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