The first was to come up with a pre-agreed physicalsignal for Cara's children to react to when they got too noisy and started fighting.
第一种方法是为孩子们设计一个预先约定的动作信号,当他们吵得太凶或者开始打起来的时候用作回应。
2
The conversion mechanisms of a chemical signal (gas concentration) into a physicalsignal (SAW phase velocity change) in SAW gas sensors and the way to separate them are discussed.
In the process of formation, the material must have received an environmental signal that reflects a change in climate and that can be deciphered by modern physical or chemical means.