If direct assessment in difficult, Benefit Transfer Method (BTM) is always used in evaluation process.

当直接评估存在困难时，成果参照法被经常采用。

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Large proportion of xylem benefit to the water transfer.

叶脉中木质部比重越大，越有利于水分的传输。

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Large proportion of xylem benefit to the water transfer.

叶脉中木质部比重越大，越有利于水分的传输。

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