And instead of being powered by smoky little petrol engines , they are driven electrically .
而且它們由電力驅(qū)動,代替了少煙的汽油發(fā)動機(jī)動力。
But barely 1 % of industry sales last year were hybrid or electrically powered vehicles .
但是,在去年的行業(yè)銷售中,僅有不到1%來自于混合或電動車輛。
They could power electrically driven wheels , letting an aircraft taxi without using its main engines .
它們可以給電力驅(qū)動的起落架輪子動力,讓飛機(jī)不用主引擎就能在地面滑行。
A quarter of the weight of hb-sia is accounted for by its lithium-polymer batteries , which will power the four electrically driven propellers during the first test flights .