Dark matter gives out no light and is detectable only because of its gravitational effect on visible matter.

暗物质不发光，它之所以能被发现，只是因为它对可见物质产生引力作用。

柯林斯例句

Whether a cometary outburst with a jet can cause observable short - term non gravitational effect is investigated.

探讨伴有喷流的彗星爆发是否造成可观测的非引力效应.

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