Man-made static magnetic fields are generated wherever DC currents are used, such as in electric trains or industrial processes such as aluminium production and in gas welding. 在使用直流电的地方即产生人为的静电磁场,例如在电车或诸如铝生产和气焊等工业操作程序中。
From the landscape point of view, man-made waterscape can be divided into four types, spewing, waterfall, stream and static water. spray is a form of a fountain. 从景观的角度看,人造水景可以分为四大类型即喷涌、垂落、流变及静态,喷雾是喷泉的一种。