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¡¡¡¡29.If the Earth£¬Moon and Sun move into a direct line£¬with the Moon in the middle£¬the dark body of the Moon blots out the briliant disk of the Sun£¬and we witness a solar eslipse.

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¡¡¡¡30.As natural science treats of the mutual transformation£¬changes and development of various kinds of matter£¬it is of great tmportance for us to make a profound study of it so that we may control the phenomena of nature.

¡¡¡¡×ÔÓÚ×ÔÈ»¿ÆѧÑо¿µÄÊǸ÷ÖÖÎïÖʵÄÏ໥ת»¯¡¢±ä»¯ºÍ·¢Õ¹£¬Òò¶øÎÒÃÇÉîÈëÑо¿×ÔÈ»¿ÆѧÒÔ±ã¿ØÖƸ÷ÖÖ×ÔÈ»ÏÖÏó£¬Õâ¾ßÓÐÖØ´óÒâÒå¡££¨treat of.¡££¬¡°ÂÛÊö¡±¡£´øÂß¼­Ö÷Ìåfor usµÄ²»¶¨Ê½¶Ìä´to make.¡­¡­nature×÷Ö÷ÓitÊÇÐÎʽÖ÷Óï¡£so thatÒýµ¼Ä¿µÄ×´Óï´Ó¾ä¡£be of.¡££¬¡°¾ßÓС±¡££©

¡¡¡¡31.With irrigation came surplus food£¬which meant that large numbers of people were freed trom the land to pursue nonagrarian specialities¡ªtechnological development£¬scholarship for its¡¡sake¡ª¡ªand war.

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¡¡¡¡With the approach of sunset it became chilly£¬come surplus foodÊǵ¹×°ÓïÐò£¬foodÊÇÖ÷ÓcameÊÇνÓï¡£whichÒýµ¼ÌØÖÖ¶¨Óï´Ó¾ä£¬Ö¸ÉϾ仰¡£²»¶¨Ê½to pursue.¡­¡­warÓнá¹û×´ÓïµÄÒâζ¡££©

¡¡¡¡32.First of all£¬¡¡Kepler found that each planet goes around the sun in a curve called an ellipse£¬with the sun at a focus of the ellipse.¡¡¡¡-

¡¡¡¡¿ªÆÕÀÕÊ×ÏÈ·¢ÏÖÁËÿ¸öÐÐÐǶ¼ÒÔÍÖÔ²ÇúÏßÈÆÌ«ÑôÔËÐУ¬Ì«ÑôÔòλÓÚÍÖÔ²µÄ½¹µã¡££¨with the¡¡sun at£¬¡­¡­Îª½é´Ê¸´ºÏ½á¹¹×÷×´Ó²¹³ä˵Ã÷¡££©

¡¡¡¡33.It should be noted that a rocket does not depend on the atmosphere for its propulsion£¬but would actually perform better in the absence of an atmosphere becauseOf lessened air resistance.

¡¡¡¡Ó¦¸Ã×¢Ò⣬»ð¼ýµÄÍÆÁ¦Óë´óÆøÎ޹أ¬ÔÚûÓдóÆøµÄÇé¿öÏ£¬ÓÉÓÚ¿ÕÆø×èÁ¦¼õС£¬»ð¼ýʵ¼ÊÉÏ»áÔËÐеøüºÃ¡££¨in the absence of anatmosphereº¬ÓÐÐéÄâÌõ¼þµÄÒâζ¡££©

¡¡¡¡34.Electrical power is always carried over long distances as a high-tension current at low-currentstrength.It is also sent as an alternating current£¬for such current is comparatively easily transformed eitherup ordown in voltage.

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¡¡¡¡35.When one considers the immense change in the size and reliability of computers and all other electronic devices that has taken place£¬it is clean that computers for doing this type of control of movement according to sense impression will certainly be available.

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¡¡¡¡36.In l664 the great English diarist£¬John Evelyn£¬published£¬with the approval of the Royal Society of London£¬a book Sylva or a Discourse of Forest Trees in which one sees£¬perhaps for the first time£¬a realization that trees£¬then so important in the construction of ships£¬were indeed becoming sadly depleted and that something urgently needed to be done by way of deliberate planting to ensure enough for the future.

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