travel的-ing形式是traveling还是travelling?

travel的-ing形式是traveling还是travelling? travel的名词形式 travel 和happen的ing形式要双写最后一个字母吗? travel的动名词形式是traveling还是travelling travel travel travel Travel travel travel travel的现在分词形式是什么 travel的过去式是啥. travel变ing怎么变 旅行社的英文翻译是Travel Agency还是TRAVEL SERVICE? travel的ing形式是否双写ltraveling 和 travelling 是不是都对 他们有什么区别吗 我的兴趣是弹钢琴、玩扑克、旅游,的英语怎么说?是不是My hobbies are play piano,travel and play card.play、travel要不要加ing? at the travel agent office 还是 at the travel agent's office?缩写形式是 at the travel agent's i like travel (travel)能加ing吗