Cambodia: primary language is Khmer — English gets you by in tourist areas, but is inconsistent elsewhere.
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The primary language in Cambodia is Khmer.
English gets you by in tourist areas, but is inconsistent elsewhere. Reasonably common in Siem Reap and Phnom Penh's tourist areas, much more limited in rural regions.
Learning "hello," "please," "thank you," "excuse me," and "the check please" in the local language goes a long way anywhere, including Cambodia — locals consistently appreciate the effort.
Yes — an offline translation app is genuinely useful in Cambodia, especially outside major tourist areas.