The oil pan and the lower part of the cylinder block together are called the crankcase; they enclose, or encase, the crankshaft.是什么意思_The oil pan and the lower part of the cylinder block together are called the crankcase; they enclose, or encase, the crankshaft.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句