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English
Good afternoon
Chinese
下午好
Pinyin
xiàwǔhǎo
Literal meaning:
Afternoon Good
Usually you'd go with 你好 (nǐhǎo), since that wouldn't cause any confusion. If a foreigner suddenly throws around with uncommon phrases, the native Chinese may not readily understand you. They may even pretend to understand what you said, even though they really thought you said some fancy English word.