In vitro material is always difficult to survive because of freeze injury during ion beam implantation.

离子注入过程中活体材料往往由于真空造成的冻害而不能存活.

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Difference of temperature between every freeze injury grade of lichi turned to disappear when grade increased.

荔枝树各个冻害级别之间温差随着冻害级别的提高而缩小.

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