Ribs should not be high or narrow; this makes it difficult for the material to flow.

加劲肋不要过高、过窄，因为这会造成材料流动困难。

youdao

To stiffen the shells, we added narrow carbon covered foam ribs on the inside.

僵硬的炮弹，我们增加了狭隘的碳泡沫肋骨涵盖在里面。

youdao

At the end of the 19th century, some women even had ribs removed so they'd have that perfect narrow waist.

十九世纪末，有些女人甚至拿掉一些肋骨，只为拥有完美的柳腰。

youdao

It is advantage United - who suffered a scare late on when Rio Ferdinand went off after suffering a blow to the ribs - but the narrow lead still leaves the semi-final in the balance ahead of next week's return game.

BBC: Man Utd 1-0 Arsenal