Gatecrashing
v. 不请自到, 无票入场( gatecrash的现在分词 )
🗣️ 情景例句
Nice to meet you, Mr. Baker.
很高兴见到你， Baker先生。
Do as the Romans do.
入境要问俗。
and a period (which is the time it takes a wave crest to travel one wave length).
和周期（浪峰走过一个波长所需的时间）。