### Chinese: 美国海军舰队中14艘“雷鸣潜艇”的行踪通常是被严格保密的。
### English: The whereabouts of the 14 Thunder submarines in the U.S. Navy's fleet are usually closely guarded.
### Errors: There is a major error of terminology is non-standard or does not fit context. terminology is used inconsistently at "Thunder submarines". There is a minor error of incorrect translation has stylistic problems at "U.S. Navy's fleet".

### Improved English: The whereabouts of the 14 “Boomer Submarines” in the US Navy fleet are usually strictly confidential.