by Colin McIntosh, The Cambridge English Dictionary is constantly being updated and expanded to reflect the interests of our users. One area of particular interest to our users is that of English Language Teaching (ELT), and a number of ELT terms have recently been added to the dictionary.y Colin McIntosh, The Cambridge English Dictionary is constantly being updated and expanded to reflect the interests of our users. One area of particular interest to our users is that of English Language Teaching (ELT), and a number of ELT terms have recently been added to the dictionary.
A diode is a one-way âvalveâ for electric current, analogous to a check valve for those familiar with plumbing and hydraulic systems. Ideally, a diode provides unimpeded flow for current in one direction (little or no resistance), but prevents flow in the other direction (infinite resistance).
Though it is believed that north-flowing rivers are oddities, in actuality, the only thing that influences the direction in which rivers flow is gravity. Rivers flow in whichever direction elevation descends. It is not uncommon for rivers to flow north, and many more rivers in addition to the Nile do flow north. The misconception that rivers only flow south is thought to be an indirect consequence of the way in which students learn geography.