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Dr. Kroo points out that the aircraft could be separated by several nautical miles, and would not be in the unnervingly easy groupings favored by display teams like the Red Arrows.

克罗博士指出，这种飞机可以相隔几海里，而且不会呈现出像红箭队这样的展示队伍所青睐的那种令人不安的简单组合。

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Multiple jobs should be separated by spaces.

多个作业应该用空白分隔。

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Normally, safety dictates that flights be separated by five nautical miles or 2, 000 feet vertically.

ECONOMIST: A jam at 32,000 feet

The two sides did, however, agree to be separated by a demilitarised buffer zone.

ECONOMIST: A Sudanese accord: Better than nothing | The

As long as aircraft are imprecisely tracked over the ocean, as they are now, they need to be separated by up to 100 nautical miles.

BBC: The key to preventing lost planes