The first time the stress test was carried out and repeated the material became less stiff and strong, but the team says that further compressions made very little difference.
第一次试验后材料表现不错，直至反复试验之后，材料的硬度和轻度都有所下降，但是小组人员说，再试验下去材料的变化也不会太大了。
The first time the stress test was carried out and repeated the material became less stiff and strong, but the team says that further compressions made very little difference.
第一次试验后材料表现不错，直至反复试验之后，材料的硬度和轻度都有所下降，但是小组人员说，再试验下去材料的变化也不会太大了。
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