The gap between them will change as the ships pass over regions of higher and lower mass, providing clues to the density of the subsurface moon.

两个飞行器间的距离会随着飞船经过的区域的密度高低的变化而改变，为月球表面的密度提供线索。

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This means that the lowest mass black holes may be very rare, short-lived or non-existent, creating a conspicuous gap between the most massive neutron stars and the least massive stellar black holes.

也就是说，那些最小的黑洞恐怕真是转瞬即逝或者压根就没存在过。这使得最大的中子星与由最小质量恒星产生的黑洞间存在巨大的差距。

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The air gap control with the mass change of magnetic suspension nonlinear system and the large scope variety of air gap is considered.

考虑磁悬浮非线性系统在质量变化和空气间隙大范围变化情况下的空气间隙控制问题。

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Car makers are betting that mass production will help them close the gap after 2004.

ECONOMIST: Fuel cells meet big business

Mass production will eliminate some of that gap, but not all of it.

ECONOMIST: Fuel cells hit the road

Ms Cooper adds that because New Zealanders are geographically remote and have little exposure to mass labels, like Gucci and the Gap, designers ignore the rules.

ECONOMIST: The unlikely rise of New Zealand's fashion industry