A black hole is an object so dense (and thus with such a strong gravitational field) that nothing-not even light-can escape it.
黑洞是一种密度极大(这也就产生了极强的引力场)以致于一切东西——包括光——都无法逃逸出来的天体。
The gravitational field is so strong that the escape velocity near it exceeds the speed of light.
重力场是如此的强大以致于靠近它的逃逸速度超过光速。
Mulching with straw in ginger field could make ginger leaves thicker, content of chlorophyll lower than those of shaded ginger, and increased the ability of adapting strong light.
姜田地面覆草，可使生姜叶片较传统插草变厚，叶绿素含量降低，增强生姜叶片适应强光的能力。
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