Is mainly the size effect and solidification, shrinkage, stress and other issues clearly, to avoid or reduce the segregation, iron manhole cover deformation and crack defects.

主要是明显的尺寸效应和凝固、收缩、应力等问题，避免或减少铸铁井盖的成分偏析、变形、开裂等缺陷的产生。

youdao

Due to the disfigurement on compressor cavity cover by fabrication and the reduplicative striking by gas, the crack on the cavity cover is one of the most destructible accident.

由于压缩机气缸缸盖制造上的缺陷和承受气体的反复冲击，气缸缸盖产生裂纹是比较容易出现的问题之一。

youdao

Based on the hierarchical block element method presented earlier, a new concept of subordinate cover and a method to simulate the tension crack in rocky block are proposed.

基于阶谱块体单元法，提出了二次覆盖的概念和一种分析岩石块体受拉开裂破坏的方法。

youdao

The new tax law is the duct tape used to cover, yet another crack in the Hoover Dam we call the tax code.

FORBES: What the New Tax Law Really Means and New 'Tax Price Points'

You didn't really think that just because the Computex trade show is going on halfway around the world, we wouldn't send a crack team of reporters to cover the event, did you?

ENGADGET: Chinese does Computex