求翻译：由于石油属于不可再生资源，随着当今石油的使用量 逐步扩大，石油储量必然越来越少，再加上世界上最大的产油区——中东，其政 治的不稳定，使得油价忽高忽低，但总的趋势是逐渐变高是什么意思？

Since oil is a non-renewable resources, gradually expand the use of today's oil, the oil reserves will become increasingly less, plus the world's largest oil-producing region - the Middle East, its political instability, oil prices suddenly valleys, but the overall trend is gradually becomes higher

Since the oil is a non-renewable resources, with today's oil use, step-by-step expansion will become increasingly less oil reserves, coupled with the world's largest oil-producing areas - the Middle East, and its political instability in which oil prices fluctuated, but the overall trend is becoming

Because the petroleum belongs to the non-renewable resources, gradually expands now along with the petroleum amount of use, the prospective oil are inevitably more and more few, in addition in the world the biggest oil-producing area - - Middle East, its politics is unstable, causes the oil price to

Because the oil is non-renewable resources, as today's petroleum usage and gradually expand, less and less oil reserves, coupled with the largest oil-producing region in the world--the Middle East, its political instability, high and low oil prices, but the general trend is getting high

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