課文翻譯

The most basic building block of matter is an atom: the smallest unit of matter into which an element can be divided and still retain its chemical properties. The idea that all elements are made up of atoms is called the atomic theory. It is the most widely accepted scientific theory in chemistry. (For more information on the nature of atoms see Supplement 7,p.S32.)


原子是物質組成的基本單位也就是一種成分可以被分解並且能夠保有化學性質的最小單位,全部的元素都是原子所組成的想法叫做原子理論,這是在化學方面最為廣泛接受的理論

課文翻譯

Reliance on Solar Energy:the sun warms the planet and supports photosynthesis used by plants to provide food for themselves and for us and other animals.

依靠太陽能：陽光溫暖的星球，並支持所使用的植物光合作用為他們自己和我們和其他動物提供糧食。

課文翻譯

The pollutants we produce come from two types of sources. Point sources are single,identifiable sources. Examples are the smokestack of a coal-burning power or industrial plant (figure 1-9 and photo 2 on p.vi),the drainpipe of a factory,and the exhaust pipe of an automobile. Nonpoint sources are dispersed and often difficult to identify. Examples are pesticides blown from the land into the air and the runoff of fertilizers and pesticides from farmlands,lawns,gardens,and golf courses into streams and lakes. It is much easier and cheaper to identify and control or prevent pollution from point sources than from widely dispersed nonpoint sources.


我們生產的污染物有兩種來源。點源是單一可識別的來源。像是燃燒煤的能力或者工業植物(在p.vi上的圖1-9 和照片2)的煙囪,工廠的下水道，以及汽車的排氣管。非點源的驅散經常難以被鑑定。像是從土地吹進肥料和來自農田的殺蟲劑和空中的殺蟲劑，溪和湖邊的草坪，花園和高爾夫球場。和廣泛驅散的非點源相比，鑑定並且控制或者防止點源的汙染是非常容易和便宜的。

我家附近地標

檢視較大的地圖