Gb	Eng
这艘船是被一艘核潜艇击沉的。	The ship was sunk by an atomic submarine.
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.