强迫次重力波的形成机制为海浪的波-波非线性相互作用，它仅依赖于海浪和水深的大小。
Bound infragravity waves are forced by wave-wave nonlinear interaction of two wind waves, depended only on the swell energy and water depth.
1938年杰克·宾得（作为一个艺术家而闻名）第一次使用“零重力”，事实上是指地球核心的无重力状态。
The first known use of "zero-gravity" is from Jack Binder (better known for his work as an artist) in 1938, and actually refers to the gravityless state of the center of the Earth's core.
没有这六次“飞经”（利用各行星重力场的作用），就没办法使信使号降到能滑进水星轨道的速度。
Without its six fly-bys—which used the gravitational fields of the planets involved to counter that effect—Messenger could not have slowed sufficiently to allow it to drop into its intended orbit.
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