like: sơ nhiễm
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BEGINNER LEVEL
exact:
VNEN 
sơ nhiễm * ☊ 
primary infection * ☊
[ sơ ] : (1) fiber; (2) to stir; (3) distant, rough, elementary, sketch (a rough draft of), primeval, primitive; (4) sister (religious title)
[ nhiễm ] : to be infected, catch, contract (an illness)
[ nhiễm ] : infected