机械产品图中arced relief notches是什么意思？

The chamber has a multiplicity of stress relief notches (also known as flex ports) formed on both sides at the base of the chamber Substantially along the entire length of the chamber. Each stress relief notch is formed between a respective pair of protruding ribs along substantially the entire length of the chamber so the chamber can flex in an accordion-like or caterpillar-like manner. The chamber may be molded to include the strain relief notches.

对照上文意境，可推断：
arced relief notches 弧形的应力释放槽