这是必不可少的，因为我们当前未提供定义监测集键之间或者甚至不同监测集之间的关系的功能。
This is necessary because we currently don't provide the capability to define relationships between monitor set keys or even between different monitor sets.
下面介绍的一些小发明已经成为我们生活中必不可少的一部分，甚至没有人称其为“发明”。
We bring you some of the inventions which became an integral part of our lives and didn't even claimed the title of an invention.
甚至当他睡觉的时候，在他甜美的梦中，网上冲浪的画面也是必不可少的。
Even when he is sleeping, the image of surfing on line is also indispensable in his sweet dreams.
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