The balance of the shade and the sun on the tree-trunks and on the ground is beautiful beyond words.

射在树干与地面上的阳光和树荫，其色彩之调和，真是美得难以形容。

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If you don't trim the top of the tree to restore the balance, the tree may grow weakly.

如果你不进行修剪以恢复平衡，鳄梨树可能会长势变弱。

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Focuses on the algorithms of the minimum-delay spanning tree for the application-layer multicast, and proposes an improved BCT-H (balance compact tree-heuristic) algorithms based on strategy function.

文中着重研究构建最小延迟应用层组播树的算法，提出一种基于策略函数构造应用层最小直径组播树的启发式算法BCT - H。

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