虽然有清一代留下了大量的史料，如《晴雨录》、《雨雪分寸》、《粮价单》等，但是目前仍不能把这些因素结合起来。

Although the Qing Dynasty left a lot of historical data, such as "precipitation record", "snow measured", "single grain" and so on, but there is still not able to combine these factors.

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用MBXN作为母本分别与无香味的品种日本晴、9311配制杂交组合，用KOH法鉴定F_2代群体中单株叶片的香味，进行遗传分析。

The genetic analysis was carried out by crossing MBXN with non-fragrant Nipponbare and 9311, and checking the fragrance of leaves in F_2 generation by KOH methods.

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