这句话对吗：Crude methanol from coal andnatural gas is both favorable feedstock for the process. 受句意影响，是否应该改成Crude methanol from coal andnatural gasare both favorable feedstock for the process.虽然methanol应该是没法加s的，不可数。
我了解这几句话是对的：Crude methanol from both coal andnatural gas is favorable feedstock for the process.
It is both an art and a discipline.
It is both expensive and dangerous.
Crude methanol from coal andnatural gas is both favorable feedstock for the process.
该句both用错误。改为：
Crude methanol from coalornatural gas is favorable feedstock for the process.
或者：
Crude methanol from both coal andnatural gas is favorable feedstock for the process.
