tā / shēn qǐng / le / měi guó / de / guò jìng qiān zhèng / yǐ biàn / zài / luò shān jī / huàn chéng他申请了美国的过境签证,以便在洛杉矶换乘。He applied for a U.S. transit visa so that he could transfer in Los Angeles.