罗伯特惯用的伎俩是同时向两个姑娘求爱，直到其中一位发觉了并告诉了别一位。 Robert has been up to his old tricks; he was courting two different girls at once until one of them found out and told the other one.
那是卑鄙的伎俩！ That was a mean trick!
玩弄那套伎俩真可耻！ That was a pretty low-down trick to play!
