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.
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.
他的讲话文本得加上标点符号。
你得在每个句子的结尾打上标点符号。
You need to put a punctuation mark at the end of every sentence.
语言作为一个符号系统，在科技文体中体现得尤为明显。
Language as a semiotic system is best represented in science and technology writings.
语言作为一个符号系统，在科技文体中体现得尤为明显。
Language as a semiotic system is best represented in science and technology writings.
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