THREE:Halley's quadrant was constructed and made known by him to the Philosophical Society, in 1731, though Thomas Godfrey, a glazier, of Philadelphia, is said to have made a similar instrument a year before. As early, however, as 1727 Newton had described such an instrument to Halley, that is, a very little time before his death. This invaluable instrument has since been improved, first into a sextant, and ultimately into a complete circle. In 1758 appeared John Dollond's corrections of Newton's views of the dispersion of refracted light, and in the following year his achromatic telescope, based on his accurate discoveries.
[摘要]在秋季宝宝最常见的疾病就秋季腹泻，所以妈妈更要这时为宝宝的胃肠道做好保护，让他们吸收更多的营养物质，抵抗细菌、疾病的侵袭。
