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；
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。
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。
Because there wasn't as much dinosaur material back then, I wanted to see if it held up.
因为这里没有那么多有关恐龙的物质资料，所以我在考虑如何将研究继续。
This kind of environment is ideal because it allows students to focus on important ideas without being held back by practical concerns.
这种环境是十分理想的，因为它能够让学生将注意力集中于重要的思想，而不必为实用的考虑而分散精力。
This kind of environment is ideal because it allows students to focus on important ideas without being held back by practical concerns.
这种环境是十分理想的，因为它能够让学生将注意力集中于重要的思想，而不必为实用的考虑而分散精力。
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