以上来源于: WordNet
Every so often, a passing star or the tidal effect of the Milky Way itself jostles the cloud, sending some of the chunks sunward to light up the night sky as comets.
几乎每隔一段时间，由于受银河系本身及经过的恒星的影响，该星云就会朝太阳方向照亮夜空的彗星。
It weighs 250 tonnes, but is relatively light compared with other tidal systems which can be several times heavier.
它重达250吨，但与其他较轻潮汐系统，可几次比较重。
Previous formulas which were set up in light of semi-tidal or tidal-averaged cannot describe the variation of sediment-laden capacity with the tidal flow.
现有水流挟沙能力公式建立在潮段平均的概念之上，不能反映其随潮变化的特性。
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