在中北纬地区, 心大星再每年这个时候的黄昏后马上落下.At mid - northern latitudes, Antares sets shortly after nightfall at this time of year.更北方, 心大星则上升的更早, 反之更南方,心大星上升会稍迟.Farther north, Antares sets even earlier, whereas farther south Antares set...
I had a little yellow parakeet when I was young.我年轻的时候养了一只黄色小鹦鹉。They are like the parakeet in the mine—they are a good barometer of what’s going on.他们就像矿区的长尾小鹦鹉，就像温度计反映出周围的变化。They are like the parakeet in the mine — they...
细胞的这种向里推进标志着原肠胚形成的开始.This pushing - in of cells marks the start of gastrulation.另一派认为它们是从微小动物的 “ 种子 ” 或 “ 胚 ” 形成的.Others belived that they were formed from the'seeds " or " germs " of these animalcules.桑椹胚形成于'&...