perennial canker造句

"perennial canker"是什么意思

造句与例句手机版

On the aecial host the first signs of " C . ribcola " are yellow or red spots on the " Pinus " needles, but these are small and can be difficult to see; more visible symptoms on the aecial host includes perennial cankers which appear on the branches within two years of infection.
It's difficult to see perennial canker in a sentence. 用perennial canker造句挺难的

相邻词汇

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如何用perennial canker造句，用perennial canker造句，perennial canker in a sentence, 用perennial canker造句和perennial canker的例句由查查汉语词典提供，版权所有违者必究。