由于区分军舰和其他民用船只非常困难，所以为区分两类船只，IISS自行给出了军舰的定义。
As it can be hard to distinguish a warship from other boats, the IISS USES its own definition of what counts and what does not.
PLA海军对此印象深刻，在1980年中期，开始研究民用船只的军事使用，特别是集装箱船。
Highly impressed by such a capability, the PLA Navy began to study the military use of civilian vessels, in particular container ships, in the mid-1980s.
早先，德国对美国有承诺，德国许诺在未事先警告的情况下，不会向民用船只发动袭击，并确保民用船上人员的安全。
Earlier, Germany had made a promise to the United States. Its submarines would not attack civilian ships unless warning was given and the lives of those on the ships were saved.
早先，德国对美国有承诺，德国许诺在未事先警告的情况下，不会向民用船只发动袭击，并确保民用船上人员的安全。
Earlier, Germany had made a promise to the United States. Its submarines would not attack civilian ships unless warning was given and the lives of those on the ships were saved.
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