形容词
中文翻译：坚硬的
同义词：
['tough', 'stubborn', 'resilient']
例句：
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1.The soil is hard-grained and requires a lot of work to prepare for planting.
土壤坚硬，需要大量的工作来准备种植。
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2. He was hard-grained in his dealings with the other party.
他在与对方交易时非常强硬。
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3.The project required hard-grained analysis and planning.
这个项目需要严格的分析和规划。