primary signal face的用法和樣例：
例句
- What was needed was Heron's regula, a counter signal to rein in the chief signal, to dampen the effect of the perpetual recycling.
所以，這裡就需要某種類似於海倫的調節裝置的東西，能夠產生抑制主信號的反向信號，減弱不斷重複的循環所帶來的影響。 - A multi-kernel nonlinear diffusion model for image denoising based on image decomposition was studied, which got the major signal and the minutiae through different models.
摘要研究了一種基於圖像分解的多核非線性擴散去噪方法，利用兩個非線性擴散模型分別提取圖像的主信號和細節信息。
