话音未落，他走下演讲台，亲自揭开了一个被黑布覆盖的物体——他最新研发的人工智能水下机器人：礁石清扫器（ReefSweeper）。

In remarks from the Oval Office before he left for North Carolina, Trump said that protesters who assembled during the military parade would be met with "very big force," a dark warning that made no ...