Usually when you are invited to dinner, it is absolutely unnecessary to bring a gift except on special occasions, for example when you are going to be an overnight or weekend guest.

通常当你应邀去参加宴会时，你完全没有必要带礼物，但除了一些特殊场合，比如，如果你要在朋友那儿过夜或度周末时。

To be killed in a plane accident this weekend and there was a guest lecturer for you on Tuesday there'll be somebody alive lecturing to you.

我周末死于空难，而下星期二又有客座教授的话，就会有人活着给你们上课。

After spending the weekend as a guest in the Jone's home, Alice wrote the Joneses the usual bread-and-butter letter.

周末在珍妮家作客后艾丽丝给琼斯家写了封例行的致谢信。