Shipping has benefited for a very long time from its ability to use very inexpensive residual fuels that are essentially what's left over after oil has been refined for other purposes.

很长一段时间以来，航运业一直受益于使用非常便宜的残余燃料，这些燃料基本上是石油被提炼用于其他用途后剩下的燃料。