It has no advantage for close-growing vegetation such as lawns, pastures, or small grain crops.

对于像草坪、牧草、小粒谷物这些茂密的植物，滴灌则没有优点。

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The method overcomes the shortcoming of grain growing above the initial crystallization temperature in annealing method, successfully preparing nano-crystalline material of very small grain .

该方法避免了传统的退火法在晶化温度以上晶粒长大这一缺点，成功制备出晶粒极细小的纳米材料。

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During the austenitizing treatment process of heated, adding cerium into steel contained tin could make grain size small, and moreover, it could make the trend of grain size growing up slow.

试样经奥氏体区高温处理后，铈的添加细化含锡钢的奥氏体晶粒，并且使晶粒长大趋势变慢。

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