heart wood是什么意思

用法例句

Through the cooking experiment with the core of poplar using soda-AQ method and the pulp beating experiment,the pulp fiber of the core of poplar was analysed,the pulping and papermaking performance of the core of poplar was evaluated.

对杨木芯材进行实验室烧碱-蒽醌法蒸煮实验和打浆实验,并对杨木芯材纸浆纤维进行分析,评价杨木芯材的制浆造纸性能。