[译] 猫的胡须伸出在面孔两侧。
[误] The cat's whisker stuck out of both sides of its face.

[正] The cat's whiskers stuck out of both sides of its face.
[注] whisker 用作单数名词时，表示“（一根）须”，若要表示“连鬓胡子，颊须”时，须用其复数形式。