数学

• 保持

  Because there were so many complicated forms which were not standard about the linear map preserving positive definite matrix on Hermitian matrix space.

  Hermite矩阵空间上保持正定的线性变换形式复杂多样。

经济学

• 保全

  At the present. it is facing with many difficulties among which banks' non-performing loans is the most serious one. Therefore, systematic research on preserving non-performing loans is of both theoretical and practical significance.

  当前，国有商业银行发展中面临的突出问题是存在大量的不良贷款，对国有商业银行信贷资产保全进行研究具有重大的理论和实际意义。

农业科学

• 保鲜

  Browning and rotting are the main obstruction in preserving litchi fruit.

  果皮褐变与果实腐烂是采收后荔枝果实贮运保鲜的主要障碍。

交通运输工程

• 防护