他迅速站起来，但明显是费了很大的劲，然后又开始一声不吭地用伞打我的头。

He immediately got back on his feet, apparently with great effort, and without a word again began hitting me on the head with the umbrella.

youdao

文章还给出了两相同固体中界面声反射系数的表达式，介绍了测量界面劲度常数的超声反射谱方法。

Explicit expressions for the acoustic reflection coefficients from the interfaces are given and ultrasonic experiments for measuring the interface stiffness constants are described.

youdao

他迅速站起来，但明显是费了很大的劲，然后又开始一声不吭地用伞打我的头。

He immediately got back on his feet, apparently with great effort, without a word again began hitting me on the head with the umbrella.

youdao