瓦兆是一个汉语词语，读音是wǎ zhào，是指周代太卜所掌三兆之一。
它可以产生194兆瓦的电力，但那只是沧海一粟。
It can generate 194 megawatts of electric power, but that's just a drop in the bucket.
在不到十年的时间里，单个发电站的发电能力就从几千瓦上升到了几兆瓦，其中许多是水力发电站。
The capacity of individual power stations, many of them hydro plants, rose from a few kilowatts to over a megawatt in less than a decade.
转动轮子只需要1.5千瓦时（5.4兆焦耳）的能量，这与使用8壶家用小水壶的能量大致相同。
It takes just 1.5 kilowatt-hours (5.4 M J) energy to rotate the Wheel -roughly the same as boiling eight small domestic kettles of water.
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