Based on comparison and practice, necessity and reliability of us - age of new self-closing gas safety valves in gas purification systems are presented.
通过比较与实践，说明在煤气净化系统中，采用新型自闭式煤气泄爆阀的必要性和可靠性，并提出泄爆阀的设计技术参数。
The article compares the first language acquisition with second language acquisition to illustrate that foreign language learning must emphasize memorisation, grammar, comparison and practice.
比较母语学习与第二语言习得学习外语，可以看到学习外语必须强化记忆，强调语法，强调比较，强调实践。
The comparison shows considerable disagreement between theory and practice.
这一对比表明理论和实践之间有相当大的出入。
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