战争爆发以来,美国已派遣一支海军陆战队远征部队(通常包含三艘军舰和2000余名陆战队员),另一支远征部队及第三支航母战斗群正在前往中东的途中。
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str是大小不确定的类型,以字节序列形式存在,始终符合UTF-8编码。由于编译时无法确定其大小,因此不能直接创建str实例。这种不确定性通过&str来解决。。业内人士推荐扣子下载作为进阶阅读
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