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网络运营平台的多云网络管理技术白皮书https://play.google/store/apps/details?id=com.duolingo Babbel: https://play.google/store/apps/details?id=com.babbel.mobile.android.en Busuu: https://play.google/store/apps/details?id=com.busuu.android.en Rosetta Stone: https://play.google/store/apps/details?id=com.rosettastone.mobile.android LingoDeer: https://play.google/store/apps/details?id=com.lingodeer.app iOS Duolingo: https://apps.apple/us/app/duolingo-language-lessons/id570060128 Babbel: https://apps.apple/us/app/babbel-language-learning/id492100982 Busuu: https://apps.apple/us/app/busuu-learn-languages/id429187274 Rosetta Stone: https://apps.apple/us/app/rosetta-stone-learn-languages/id535851788 LingoDeer: https://apps.apple/us/app/lingodeer-learn-languages/id1172667425