The researchers don't suggest any specific reasons for this shrinkage, but they do point out that they can now rule out one possibility for sure: technology.
研究人员没有给出具体原因，但他们明确指出这绝非科技进步的结果。
2
A general rule of thumb for conventional room-temperature cured polyesters is 1/32 inch of shrinkage per linear foot when reinforced with 25 weight percent glass content.