These algae now release their oil, which floats to the surface of the culture vessel.
现在，这些藻类可以释放出藻类油，藻类油能漂浮到培养容器的水面上。
And then there is algae. Its oil can be used for fuel.
另外还有水藻，它的油质可以用做燃料。
Many algae make oil, which they store as a foodstuff against an uncertain future.
许多藻类会生成油，作为食物储存以备不时之需。
A future source of such biodegradable plastics might even come from algae-derived oil.
这种未来材料——可生物降解的塑料也许就来自于藻类衍生的油中。
Now, even big oil is interested in algae.
现在，即使是大的石油感兴趣的藻类。
藻类可自然产生油料。
There's just one snag—harvesting the oil from algae-filled water is prohibitively expensive.
但是，这种获取燃料的方式还存在一个障碍：从充斥着藻类的水中收集油料的成本是极其昂贵的。
There's just one snag—harvesting the oil from algae-filled water is prohibitively expensive.
但是，这种获取燃料的方式还存在一个障碍：从充斥着藻类的水中收集油料的成本是极其昂贵的。
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