... special-grade特级的 hard结实又硬的 flesh果肉 ...
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结实又硬的
Firm and hard
以上为机器翻译结果，长、整句建议使用 人工翻译 。
那时想把橡胶做得既硬又结实的尝试全失败了。
At that time every attempt to make rubber hard and strong came to nothing.
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后来，他的一个朋友发现在橡胶里掺入硫磺，经过日晒，可以使橡胶变得又硬又结实。
Later, a friend of his had the idea that rubber might be made hard and strong if mixed with sulphur and put in the sun.
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