In physical and mechanical indexes, the basic density, air-dried density, compression strength parallel to grain, MOR, MOE and toughness of mature wood are higher than that of juvenile wood.

在物理力学性质指标中成熟材的基本密度、气干密度、顺纹抗压强度、抗弯强度、抗弯弹性模量及冲击韧性高于幼龄材；

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Songs from the beginning of the wood softly playing rhythm guitar, into singing, with the expansion of emotion, the problem of juvenile Witt in the looming in Drifting.

歌曲从一开始的木吉他轻声的打节奏，到进唱，随着情绪的扩展，少年维特式的烦恼在若隐若现中飘荡。

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Songs from the beginning of the wood softly playing rhythm guitar, into singing, with the expansion of emotion, the problem of juvenile Witt in the looming in Drifting.

歌曲从一开始的木吉他轻声的打节奏，到进唱，随着情绪的扩展，少年维特式的烦恼在若隐若现中飘荡。

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