名词
中文翻译：致密的
同义词：
['dense', 'compact', 'compacted', 'solid']
例句：
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1. The soil is peptogenic, which makes it difficult to grow crops.
土壤致密，不利于农作物生长。
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2. The peptogenic material is hard to break down.
这种致密的物质难以分解。
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3. The peptogenic substance has been found to be toxic.
这种致密物质被发现是有毒的。