两个竞争的激光手术系统正在美国进行临床试验。
Two rival laser surgery systems are undergoing clinical trials in the U.S.
两个相互竞争的激光手术系统正在美国进行临床试验。
Two rival laser surgery systems are undergoing clinical trials in the US.
中国宣布，它试验了一种先进的反导拦截系统。此举提醒人们，中国正在快速推进其军事能力的技术升级。
China says it has tested an advanced missile interception system, a move that serves as a reminder of the rapidly progressing technological upgrade of its military capabilities.
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