gravitational contraction meaning in English

引力收缩
重力收缩

The criterion for gravitational contraction set by equations (3. 4) is significantly weaker for more massive clouds .
由（34）式建立的引力收缩判据，对质量较大的云是很牵强的。
The criterion for gravitational contraction set by equations ( 3 . 4 ) is significantly weaker for more massive clouds
由（ 3 4 ）式建立的引力收缩判据，对质量较大的云是很牵强的。
The electron degenerate pressure does not come from the burning of any nuclear fuel and can therefore support the star from further gravitational contraction forever
电子简并压力并非来自任何核反应所以它能永远抵抗恒星的引力。
The helium core of the star starts to collapse . this gravitational contraction will heat up the hydrogen envelope surrounding the core . fusion therefore begins in the envelope and the star expands
剩下的氦核心便会开始塌缩并产生热，紧邻核心的氢外壳会被加热而开始有热核反应恒星亦同时膨胀。
Can stop the star from further collapsing . note : again , neutron degenerate pressure does not come from nuclear burning . it can support a neutron star from further gravitational contraction forever
则足以防止恒星进一步收缩同电子简并压力一样中子简并压力并非来自核子反应它可永远?抗恒星的引力收缩。