如何预留槽的工作呢？
已有工程实践表明，趾板不分缝，采取预留宽槽跳仓浇注可能是解决趾板裂缝的有效途径。
It is shown by engineering practice that if the plinth is not partitioned by slits the problem may be solved by wide trough left in advance.
软件扩展槽就是在软件成品中预留便于扩展的结构，目的是便于软件维护和升级。
Software extensible slot means to pre_arrange some stru ct ures in finished software products for function extension, in order to maintain a nd update the software present.
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