定做矫正器，来自桶形石膏夹制备的嘴和牙齿模具，显著降低呼吸暂停-呼吸减慢指数，而热塑性矫正器则无效。

The custom-made devices, created using a plaster cast of the patient's mouth and construction bites, significantly reduced the apnea-hypopnea index, whereas the prefabricated devices did not.

youdao

指数是无效的，当它比数组的下限或大于或等于其包含的元素数量降低。

Index is invalid when it's lower than array's lower bound or greater or equal than number of elements it contains.

youdao

这就是他为什么买这么多，如期货指数挂钩票据，这是昂贵的和无效的，并造成重大损失渣打银行(中国)。

That's why he bought so many futures such as index-linked notes, which are expensive and ineffective and have caused great loss to SCB (China).

youdao