在这种情况下，你必须更加谨慎地来判断某些特征是否是人造石油的。

In these situations, you have to be more cautious about concluding a feature is manmade oil.

泄漏的人造石油并不是唯一可以导致海面的日光反射发生亮度变化的事物。

Leaked, manmade oil is not the only thing that can cause variations in the brightness of the Sun's reflection off the ocean.