President Trump said if sanctions don't work, the US will move to phase II in its pressure campaign which could be very rough.

特朗普总统表示，如果制裁不奏效，美国将进入压力运动的第二阶段，这可能是“非常残酷的”。

For example, in pharma, we know that you start with phase I trials and phase II trials, and then you go to phase III.

例如，在制药业，我们知道你从第一阶段试验和第二阶段试验开始，然后你进入第三阶段。

Yeah, so there have now been phase II and increasingly, phase III studies.

是的，所以现在已经进行了 II 期研究，并且越来越多地进行了 III 期研究。

Phase II trials focus on determining the right dosage and delivery schedule across a wider population.

II 期试验的重点是在更广泛的人群中确定正确的剂量和给药时间表。

And in June, a phase II trial found that nitrous oxide—laughing gas—might have a similar effect.

6 月，一项 II 期试验发现， 一氧化二氮（笑气）可能具有类似的效果。

The team said if chosen by NASA to continue with Phase II, it will be centered on improving the performance of the proposed engine, as well as carrying out experiments on major engine systems.

该团队表示，如果被美国国家航空航天局选中继续进行第二阶段，其工作重点将是提高拟议发动机的性能，以及对主要发动机系统进行实验。

Researchers initially test candidate vaccines on animals first in pre-clinical trials , and if testing goes well, the candidate vaccine can begin human clinical trials starting with phase I, then phase II, and finally phase III.

研究人员首先在动物身上进行临床前试验来测试候选疫苗，如果试验进展顺利，可以开始对候选疫苗进行人体临床试验，从I期试验，到II期，最后III期。