intr。(不及物动词) To exist in actuality; have life or reality: 有,存在:存在于现实中;有生命或现实性: I think, therefore I am。 我思故我在 To occupy a specified position: 在:占据一个特定的位置: The food is on the table。 食物在桌上 To remain in a certain state or situation undisturbed, untouched, or unmolested: 处于,持续:保持某一种状态不受干扰、没被触碰、没被干涉妨害: Let the children be。 随这些孩子们去 To take place; occur: 举行;发生: The test was yesterday。 昨天进行了测验 To go or come: 去或来: Have you ever been to Italy? Have you been home recently? 你曾经去过意大利吗?最近你回过家吗? Usage Problem Used as a copula in such senses as: 【用法疑难】 是:在下面的意义上作系动词使用: To equal in identity: 是:介绍相等的身份: “To be a Christian was to be a Roman”(James Bryce) “如果是个基督徒就等于是个罗马人”(詹姆斯·布赖斯) To have a specified significance: 具有特殊意义: A is excellent, C is passing。 Let n be the unknown quantity。 A表示优秀,C表示及格。n表示未知数 To belong to a specified class or group: 类:属于一个特定的阶级或团体: The human being is a primate。 人类是灵长类动物 To have or show a specified quality or characteristic: 是:具有或表现出特定的性质或特点: She is lovely。 All men are mortal。 她是可