Specifies that this parameter is not required when the procedure is called.
指定调用过程时此参数不是必选项。Competing with the state-owned capital and foreign capital, the only way is to be bigger and stronger.
民营企业要与国有资本和外国资本竞争，做大做强是必经之路。It would also be a natural step for a family-owned firm of this size, bankers say.
银行家认为，对于如此规模的家族企业来讲，上市本是必经之路。The Inside Job is a must-see, since the eventsexposed in this film are shaping the future of every American.
《监守自盗》是必看的电影，因为影片曝光的事件影响了所有美国人的未来。Prayer need not be long to be heard. It just needs to be from the heart.
祷告不需要很长才会被上帝聆听，它最要紧的是必篢发自内心。DOCTYPE declaration is mandatory if the document is to be processed in a validating environment .
如果文档要在验证环境中进行处理，DOCTYPE声明是必选项。Friendship is to be not allowed to lack for necessarily in people's life.
友谊在人们的生活中是必不可缺的。The other landmark like Big Wild Goose Pagoda mirrors China "s long history. Xi'an is undoubtedly one of the must-visit cities. "
其他的标志性建筑像大雁塔展现了中国悠久历史，西安毫无疑问是必到的城市之一。Just at this moment, she fell back into the river If she were carried down, it would be certain death.
就在这一刻，她掉进了河里，如果她回来进行下来，这将是必死无疑。