1·How do we know when to invest in an upgrade?
我们如何知道何时投资升级？
2·People should upgrade their devices regularly.
人们应该定期升级他们的设备。
3·In 1944, Congress passed a bill to upgrade the system, but did not fund the plan right away.
1944年，国会通过了一项升级系统的法案，但没有立即为该计划提供资金。
4·There's less pressure on the airlines to upgrade the interior, unless it's a safety issue or a redesign that will save money.
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。
5·So he recommended they upgrade their software programs and that, in turn, cut operational costs and just speeded everything up.
所以他建议他们升级他们的软件程序，这反过来降低了运营成本并让一切快速运转。