然后从理论知识出发详细介绍了SOA，分析了它的背景、特性。
Then it introduces the SOA in detail, including its background and peculiarity.
从理论知识分析，应合理确定基础理论、专业理论与专业技术三者比例，较侧重于专业理论。
Analyzing the theoretical knowledge, we should get a proper proportion among the basic theory, the professional theory and the professional kill, and focus on the professional skill.
从理论知识和经验上对组合爆破进行设计，着重说明了各种爆破参数的选择，并经过实践证实和调整。
The design emphasizes the selection of all kinds of parameters, and it is testified and adjusted by practice.
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