我说的端口保护（port protected）跟“指定的MAC”应该没有什么关系，指定MAC更像是端口安全（port security）的内容。
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protected port 保护端口 ; 端口保护
port protected
端口保护
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Naturally, it's a solid-feeling point-and-shoot, with protected components and airtight port covers.
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Despite the influx of daytrippers, the island of Porquerolles is wholly unspoilt: most of its white sandy beaches and pine woods are protected by the Parc National de Port-Cros.
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The micro-USB port is on the bottom under a tiny plastic door while the headphone jack is similarly protected at the top of the device.
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