A | SEOUL, South Korea -- The South Korean, U.S. and Japanese militaries conducted their first-ever trilateral aerial exercise on Sunday in response to evolving North Korean nuclear threats, South Korea’s air force said.The training held near the Korean Peninsula was to implement the three countries’ earlier agreement to increase defense cooperation and boost their joint response capabilities against North Korean threats, the air force said in a statement.The drill involved a nuclear-capable B-52 bomber from the United States and fighter jets from South Korea and Japan, the statement said.South Korea and Japan are both key U.S. allies in Asia, which together host about 80,000 American troops. The three countries have occasionally held trilateral maritime drills, such as anti-submarine or missile defense exercises, but Sunday’s training marked the first time for them to perform a trilateral aerial drill.In South Korea, expanding military drills with Japan is a sensitive issue, because many still harbor strong resentment against Japan’s brutal 1910-45 colonial rule over the Korean Peninsula. But the North’s advancing nuclear program has pushed South Korea’s conservative president, Yoon Suk Yeol, to move beyond historical disputes with Japan and beef up a trilateral security cooperation with the U.S. and Japan.In August, Yoon, U.S. President Joe Biden and Japanese Prime Minister Fumio Kishida met at Camp David in their countries’ first stand-alone trilateral summit and agreed to bolster their defense cooperation to deal with North Korea’s nuclear threats. The three leaders decided to hold annual trilateral exercises and put into operation by year’s end the sharing of real-time missile warning data on North Korea.Sunday’s drill could draw a furious response from North Korea, which has long bristled at U.S. training exercises with South Korea, calling them an invasion rehearsal and responding with missile tests. The North slammed the Camp David agreement, accusing the U.S., South Korean and Japanese leaders of plotting nuclear war provocations on the Korean Peninsula. North Korean leader Kim Jong Un called Yoon, Biden and Kishida “the gang bosses” of the three countries.Worries about North Korea’s nuclear program have deepened after it enacted a law that authorizes the preemptive use of nuclear weapons last year and has since openly threatened to use them in potential conflicts with the U.S. and South Korea.。 资料图该政府机构计划建立一个大型地下管道系统，从而将圣维森特水库跟建在附近峡谷中约1100英尺的新水库连接起来。当太阳在天空中高高挂起时，加州的大型太阳能发电系统会将把水抽到上面的水库然后储存起来供以后使用。
B | 之后，这些水电池将在太阳下山时启动并产生更多的电力。当水从作为“水电池”的上层水库中释放出来时，其将驱动涡轮机，以提供500兆瓦的电力约8小时。
C | NPR说，这足以为约13万个标准家庭提供电力。这是一种有趣的方式，它可以利用太阳能的好处但无需依赖恒定的阳光，并且这也是一种可以在其他有大湖的地方使用的方式。水电池至少在十年内不会启动和运行，但有关当局表示，这可能会永远改变圣地亚哥为其人民的家园提供电力的方式。
D | 该计划在最近的热浪中取得了成果，看到加州的许多地方在夜间挣扎以满足电力需求。然而在白天，电网的电力负荷过大，系统无法全部利用它。这些新的水电池将允许额外的电力被储存，然后在以后最需要的时候使用。
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Published on:03:48:05
