### 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 "<v>Thunder</v> submarines" in the U.S. Navy's fleet are usually closely guarded.
### Errors: There is a minor terminology/inconsistent error at "Thunder" within <v></v>.

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