黄土高原地区地形破碎，坡地所占比例大，水土流失严重。
There are broken topography, large slope land and severe soil erosion in the Loess Plateau.
由于稠油段油层原油的粘度高，重烃组分所占比例大，因此造成采出井采出困难。
The viscosity of crude oil from viscous oil reservoir is high and heavy hydrocarbon components constitute the majority. So, it is difficult to produce oil from production Wells.
城市养殖、种植业中，外来人工引种所占比例大，尤其是城市宠物市场中的外来猫、狗。
In urban breedings and agriculture, many alien species are imported, especially the pets like cats and dogs.
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