名词
中文翻译：Unknown
同义词：
['cultivated selection', 'improved variety', 'improved strain']
例句：
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1. The farmer carefully selects the best cultivated varieties for his crops.
这位农民精心挑选出最好的栽培品种来种植他的庄稼。
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2. The research team has developed a new improved variety that can withstand harsher weather conditions.
研究小组开发了一种新的改良品种，能够抵抗更恶劣的天气条件。
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3. The gardeners are experimenting with different cultivated strains to improve their plant's growthrate.
园丁们正在尝试不同的栽培品种来提高植物的生长速度。