The bottom layer has no dependency on the upper layers due to a loose-coupling design.

由于采用松散耦合的设计，下面的层并不依赖于上面的层。

youdao

When you reach the bottom, cut the needle loose and tie the two spare threads together - I like a lavish bow!

从顶上引线再次回到底部时，就可以和原先留的线头一起打个结啦——一个夸张的大蝴蝶结！

youdao

Pump impeller loose, grinding to pump out the bottom end caps.

水泵叶轮松动，磨到水泵出水底端盖。

youdao

Ferdinand looked to have sealed it when he calmly sidefooted a loose ball into the bottom corner after a cross from the third former Tottenham player in the Sunderland starting line-up, the influential Steed Malbranque, caused yet more problems.

BBC: Sunderland 3-1 Tottenham

It should be creamy but loose enough to streak the bottom of the pan.

WSJ: Marc Vetri's Spaghetti in Parchment With Clams | Slow Food Fast

He sat in his car for the next 17 minutes while the team tried to get to the bottom of the problem which apparently was a connector that had worked loose and needed re-attaching.

BBC: SPORT | Motorsport | Formula One | Turkish GP qualifying as it happened