求翻译：我们常把老师的奉献比作春蚕到死丝方尽，蜡炬成灰泪始干。人间最伟大的奉献也在于此，教师把自己所学的知识传授给学生，一批批的学生成为国家栋梁而奔赴社会建设的洪流。当老师们放下手中的粉笔，满头银丝的时候，感叹桃李满天下的时候，他们才真正感触到奉献之后的欣慰。是什么意思？

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We are often the teacher's dedication to the Dead Sea than to spring silkworms, wax to do their utmost to torch into gray Tears began. Earth, the most great dedication, a teacher was also the case with the knowledge of the students themselves, and a large number of students taught the students to be

正在翻译，请等待...

正在翻译，请等待...