單元素探頭的視角有限，無法對任意點做動態聚焦，造成聚焦效果變差以及SN

單元素探頭的視角有限，無法對任意點做動態聚焦，造成聚焦效果變差以及SNR下降

結果 (英文) 1:

Limited perspective of the single-element probe, do not focus on any point in the dynamic, resulting in focusing effect of variation and degradation in SNR

結果 (英文) 2:

The limited viewing angle of the single-element probe makes it impossible to dynamically focus on any point, resulting in poor focus ingress and snR drops

結果 (英文) 3:

The angle of view of single element probe is limited, so it can't focus any point dynamically, resulting in poor focusing effect and SNR decline