诚然，人们采用简单的余热利用方式已有一段时间了，例如，用有较高温度的废水作为地热取暖和融化车库前私家车道上的结冰。
True, some simple forms of heat recycling have been around for a while: using heated waste water to warm flooring and melt ice on driveways, for example.
早在公元前7世纪，人们就利用简单的放大镜将阳光集成一束，利用热量点燃木材。
As early as the 7th century B.C., people used simple magnifying glasses to concentrate the light of the sun into beams so hot they would cause wood to catch fire.
人们利用很多种计时的设备，如日晷就是早期较为简单的一种。
Humans have used many devices to measure time. The sundial was one of the earliest and simplest.
紧凑化了的城市地区中临时闲置的土地为人们提供了进行创造性的场地利用、即兴活动和简单活动的空间。
Temporary fallow lands in densified urban areas offer Spaces for the creative use of their grounds, instantaneous activities, and simple implementations which particularly fit the needs of youngsters.
简单地介绍了一些放射性元素的性质和应用，以便人们正确的认识和利用放射性元素。
This paper introduces the properties and application of some radioactive elements, aiming at making people to understand and use radioactive elements correctly.
早在公元前7世纪，人们就利用简单的放大镜将阳光集成一束，利用热量点燃木材。
C., people used simple magnifying glasses to concentrate the light of the sun into beams so hot they would cause wood to catch fire.
早在公元前7世纪，人们就利用简单的放大镜将阳光集成一束，利用热量点燃木材。
C., people used simple magnifying glasses to concentrate the light of the sun into beams so hot they would cause wood to catch fire.
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