Task: Translation
Input (English): As he prepared to board a plane out of Canada, Canada Border Services agents took the man into custody at Pierre Elliott Trudeau International Airport in Montreal on Tuesday.
Output (Chinese): 当他准备登机离开加拿大时，加拿大边境服务机构周二在蒙特利尔的皮埃尔埃利奥特特鲁多国际机场拘留了他。