柴油潜艇在水下只能航行非常短的时间,而核潜艇在水下航行的时间要长得多。 A diesel submarine is able to cruise under water for a short period of time, but a nuclear one is able to cruise under water much longer.
他们利用自己的实践经验,设计了一台气冷柴油机。 Drawing on their practical experience, they designed an air-cooled diesel motor.
至于动力方式是采用“蒸气式”抑或“柴油式”,我想贵公司将交由我方全权处理吧? And the propulsion method whether steam or diesel, you'll leave to us, I suppose?
蒸汽机车已被柴油内燃机车所取代。 The steam locomotives were superseded by diesel units.