那么，按照我们刚才说的说明文题材，我们主要需要找的为plug-in vehicle的说明信息（i.e. 功能，优缺点等），所以需要概括的点如下：
说明1：功能 – 充满电可以跑50-100km
Its big on board batteries will have been fully charged overnight, with enough power for you to drive 50-100 kilometers through city traffic.
说明2：功能 – 可以反哺供应商电
allowing them（注意代词哦：your favorite electricity supplier） to draw a limited amount of power from your car’s batteries
说明3：功能 – 没电的时候有备用引擎
If, driving home or for some other reason your batteries looked like running flat, a relatively small, but quiet and efficient engine running on petrol, diesel or compressed natural gas, even bio-fuel, would automatically cut in, driving a generator that supplied the batteries so you could complete your journey.
the world’s almost total dependence on petroleum-based fuels for transport is, in every sense of the word, unsustainable.
因为这4个点都为对plug-in vehicle的修饰与限定，而均为并列关系。所以我们可以考虑使用定语从句【which that who】来进行合并作答