请问这里的upon doing是什么意思?I was already running, and upon reaching the car across the street...upon doing 是一个句型么?谢谢

请问这里的upon doing是什么意思?I was already running, and upon reaching the car across the street...upon doing 是一个句型么?谢谢 英语翻译Upon return from your travels这句英语的中文意思,还有这里Upon是什么意思? impose这里什么意思?The common law impose an implied warranty of seaworthiness(内在的适航保证?）upon the Owner.请问这里impose是什么意思? upon doing upon+doingsoon you are going to have to move out,cried my neighbor upon seeing the largest tomato plant.这里的upon seeing怎么解释?（别用翻译机器翻给我啊,这样我也会的） 请问这里的nm是什么意思 请问这里的音序是什么意思 请问be available upon request 是什么意思? 用upon doing造句 upon arriving home ,the girl discovered that she had left her bag at her friend's.这里面的upon是什么意思? I don't mind doing sth .请问 这里的doing 是什么词 upon是什么意思? upon是什么意思 关于upon,at这两个介词upon departure,please leave the keys in your room.at the dialling tonw,you may enter your calling number.这里面的at ,upon分别是什么意思呢? upon+doing sth有“一.就.”的意思吗? upon在这里什么意思The achievement of one's purpose depends largely upon one's perseverance.upon在这里是什么意思? 请问bed 主要这里的seat是什么意思 请问这里面的英语是什么意思