observation/ˌɒbzə'veɪ∫ən $ ˌɑːbzər-/

n. the action or process of observing sb/sth

n. [U] 观察；监视：a student of keen observation 观察力敏锐的学生

◇[observation of sb/sth] observation of animal behaviour 对动物行为的观察

◇keep a suspect under observation 监视犯罪嫌疑人

构词observe + -ation