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美国海军退役舰长、美国太平洋司令部联合情报中心前行动总监卡尔•舒斯特（Carl Schuster）通过CNN表示：中国海军战斗力不受疫情影响的方法是，不断返回港口，更换被感染的病人，并严密封锁消息。

Meanwhile, the PLA has consistently maintained that it doesn't face the same kind of coronavirus concerns the US does, noting a month ago that not a single soldier, sailor or airman had been infected with Covid-19.

There is widespread international skepticism about that claim. But according to Schuster, China enjoys some advantages in controlling, or at least concealing, the number of infections it has in its naval forces.

While the US Navy fleet is scattered across the Pacific, far from its home shores and operating longer patrols, most PLA Navy ships are at sea under 30 days at a time and operating close to their bases, said Schuster, enabling them to "replace known infected crewmen off the ship with known healthy sailors from other ship."

"Nor do their South China or East China Sea deployments include foreign port visits. The ships go out, do a five- to 10-day exercise and return to a military home port, where security limits if not prevents any public reporting of potential infections," he added.