In any case, all countries will need to carry out good post-marketing surveillance to make sure that they pick up any early sign of a safety problem with a particular vaccine.
无论如何，各国需要在疫苗上市后密切监测，确保发现特定疫苗安全问题的任何早期迹象。
2
Perceived advances in safety—wider, straighter roadways and more electronic traffic sign—may make drivers too comfortable.
驾驶者在更宽、更直、更多交通信号的道路上行驶时，往往感到更大的安全性，便驾驶得似乎过于舒适了。
3
For the bulls, it is a sign that investors will eventually decide to reject the safety of cash in favour of the higher returns available from riskier assets.