root apex造句

Secondary roots emerge on the 4th or 5th day about 4 or 5 cm from the root apex .
在第四或第五天，距根端大约4或5厘米处发出次生根。
Root apex beyond crossing point
根锥顶至相错点的距离
Root apex to back
根锥顶至安装基准面距离
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It's difficult to find root apex in a sentence. 用root apex造句挺难的