The Chuang Tzu 》 recorded the way to take water from shaduf; Digging well for irrigation in Han Dynasty period; fixing the pond and building the aqueduct in Tang and Song dynasty , and the usage of dragon bone car, hurdy-gurdy, all recorded in history books, also recorded in 《 The Chinese agriculture history draft 》.

莊子》記載的桔槔取水免费a片视频网站；兩漢時的鑿井灌田2022中文字幕在线观看；唐宋時修塘筑渠，以及龍骨車、筒車的運用一级黄片免费看视频，史不乏書黄页网站免费视频福利区，并載入《中國農業(yè)史稿》。

There is electricity in our houses and to run pumps, so we do not have to work the shaduf.

房間里也用上了電自拍视频精品，水泵也由電力驅動国产乱了在线观看，已經不需要水車了。

There is electricity in our houses and to run pumps, so we do not have to work the shaduf.

現(xiàn)在我們一年可以種三茬莊稼而不是以前的一茬九九色这里只有精品首页。

There is electricity in our houses and to run pumps, so we do not have to work the shaduf.

現(xiàn)在我們一年收三季能直接在线看的网址你懂的，以前則是一年一季。

It absorbed the merits of different mechanical structures, applied the mechanic principles of folk waterwheel, barrel car, as well as shaduf, cam, and balance weigh beam, and thus was an automatic observatory, which had the multi function of observation, demonstration and time giving, and it gained or lost no more than one second per day. It was the ancestor of the mechanical clocks, since

它吸取各家機械結構之長歐美特級精品尤物黃片視頻，采用民間水車美屄网站、筒車，以及桔槔黄色网站久久久、凸輪国产原创麻豆高清有码在线、天平秤桿等機械原理，是集觀測污污污污污www免费网站、演示和報時為一體的自動化天文臺九九插美女视频，精確度已達到誤差每日一秒，更因為采用了早期的擒縱機構www.av小日本，成為機械鐘的祖先最新精品黄色网站久爱。