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Chuyên ngành
Đồng nghĩa Tiếng Anh
Freely, willingly, spontaneously, of (one's) own freewill, on (one's) own (initiative or recognizance orresponsibility), without prompting, without being prompted orasked, gratis, gratuitously; by choice, intentionally,purposely, on purpose, deliberately: Some of the students spenttheir summer vacation voluntarily helping the needy.
tác giả
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