引入运算符号，导得其频率方程和振型函数的解析表达式。

Furthermore, a reccursion formula of the operational symbol is introduced.

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引入运算符号，导得带任意个集中质量的梁弯曲振动频率方程和振型函数新的解析表达式。

By means of a symbol of operation, the new analytical expressions of the frequency equation and the modal function of lateral vibration of a beam with lumped masses were derived.

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他的讲话文本得加上标点符号。

The transcription of his speech must be punctuated.

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But at the end of the day, the point of the slides is not to expect you to now go write programs in C but really to just remind you that, hey, if you ever get distracted from some of the minutia that is the semicolons, parentheses, and what is very new to many of you, it's really no different than the fun and games we implemented with Scratch last week.

但是最终，我们课件上讨论的主题,并不是让你现在就写一个C语言的程序,而是要告诉大家不要你被那些分号括号,还有一些从未见过的符号等一些细节搅得心烦意乱，因为它们本质上,和我们上周用Scratch做出来的游戏,并无区别。

哈佛公开课 - 计算机科学课程节选