The celebrity checked into the hotel under an alias to avoid reporters.

那位名人用化名入住飯店，以避開記者。

Please do not post product reviews under an alias, according to company policy.

依照公司規定，請勿以化名發表產品評論。

The anonymous donor used an alias when sending the charity a large check.

那位匿名捐款人以化名寄給慈善機構一張大額支票。