In particular, each existing shape class has to add capabilities in a descendent, which runs into combinatorial complexities and difficulties in maintenance.

特别是，每个现有的形状类必须在子代类中添加功能，这使维护工作陷入了组合的复杂性和困难当中。

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Washing a car is part of maintenance in order to keep it in good shape and also as a safety measure (hard to see through a windshield full of gunk).

清洗汽车是日常维护的一部分，它既可以保持车子的外形美观，也是一个很重要的安全防护措施(布满灰尘的挡风玻璃不利于看清道路)。

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With the help of cell membrane, compartmentalization of the cell and organelles is possible which AIDS in protection of the cell and maintenance of the cell shape.

有了细胞膜，细胞便可分隔成许多部分，又可形成细胞器，帮助保护细胞及维持细胞的形状。

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Consumers will still continue spending on home improvement and maintenance projects, and LOW is in excellent financial shape.

FORBES: What Is Your Guts-to-Brains Ratio?

An army of snowploughs and maintenance engineers work 24 hours a day to ensure the ice is in tip top shape while the NCC's Ice Safety Committee monitors the ice on an hourly basis.

BBC: Embracing winter in Ottawa