您需要一些工具才能试用本教程中的代码。

You need some tools to try this tutorial's code.

其中之一要杜绝的是这样的点子：用户可免费试用本产品30天。

One idea to seriously avoid: giving users say, a 30-day limited-time free trial.

摘要：幼儿师范学校《生物学》(试用本)是我国三年制中等幼儿师范学校生物学课程使用的教科书。

Abstract: : the infant normal school "biology" (try out originally) is the textbook of the biology course usage of our country three years for medium.

因此，您必须从Sun的Web站点下载并安装JD K 1.5，才能试用本教程中开发的模式和实例文档(参见参考资料)。

So, you must download and install JDK 1.5 from the Sun Web site to try the schema and instance documents developed in this tutorial (see Resources).