航空公司内部升级的压力比较小，除非是为了安全问题或省钱而重新设计。
There's less pressure on the airlines to upgrade the interior, unless it's a safety issue or a redesign that will save money.
您可以只升级应用程序中那些需要升级的部分而保留其他部分不变。
You can upgrade only those parts of an application that need to be upgraded and leave the remaining pieces as is.
这场对抗因企业集团和出庭律师日渐升级的斗争而愈来愈曲折。
The fights are bitter, part of an escalating war between business groups and trial lawyers.
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