Therefore, business website search engine optimization is only one way operation.
所以搜索引擎优化只是企业网站运营的其中一种方法。
The engine was very smooth in operation but had one very marked disadvantage-thermal efficiency was only about 4 %.
该机在运转方面是很平稳的，但有一个明显的缺点，热效率仅为4 ％左右。
The reduction of the engine exhaust gas temperature is one of the key points of this technology, which will influence the safe operation of the entire filter system.
在这一技术中，发动机的排气降温是关键环节之一，它直接影响到整个尾气微粒过滤系统的工作安全性。
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