check knot

例句：

1. 1. The engineer checked the bolts before welding them together.
   工程师在我们焊接之前检查了螺栓。
2. 2. The check knot is a simple way to ensure that the stitches are evenly spaced.
   检查结是一种简单的方式，确保缝线均匀分布。
3. 3. The inspector carefully checked each item for quality control.
   检查员仔细检查每件物品以进行质量控制。