The stabilizing agent made the melting process steady because it held back cross-linking and aging of PVA at high temperature.

稳定剂的添加，可明显改善PVA的熔融加工稳定性，使其交联老化程度降低，薄膜的溶解性能显著提高；

youdao

I think of all the moments I have been held back from because I am afraid to experience something just because I might not be good at it or do it right.

我回想起之前大部分时刻，我因为害怕去经历某些事，仅仅是因为我怕我自己做的不够好，或者不太正确。

youdao

We feel confident; the material is seven months old, we reviewed it extensively; we held back 15, 000 documents that we felt needed further review because the type of classifications they had.

我们有信心。材料已经准备了七个月，我们看了一遍又一遍；还有15000份档案因为涉及保密需要作复审，所以暂时没有发布。

youdao

Crestor, an even more powerful statin from AstraZeneca (nyse: AZN - news - people ) could also benefit, but may be held back because it does not have the same track record of safety as Lipitor.

FORBES: Cholesterol Guidelines A Gift For Merck, Pfizer

However, he said professionals felt under pressure because of the "fear of being seen to be labelling abuse when it isn't there" and often held back from doing so until the signs were irrefutable.

BBC: When should a child go into care?