您要查找的是不是：
- Which letter is a useful inset? 哪个字母是益虫?
- Which letter is a part of your head? 哪个字母是你头上的一部分?
- Which letter is very useful to a deaf woman? 哪个字母对一个盲人而言很重要?
- It is a useful book and, what is more, not an expensive one. 这是有用的书，更难得的是不贵。
- Which letter is a kind of dink? 哪一个字母是。
- Which letter is in December but we don't see it any other month? 哪个字母在十二月份中出现,但却不会出现在其他月份?
- A sauna in the hotel will is a useful amenity. 旅馆中的芬兰蒸汽浴室倒是个有益的好设施。
- A sauna in the hotel would is a useful amenity. 旅馆中的芬兰蒸汽浴室倒是个有益的好设施.
- His letter is a total surprise to her. 他的来信完全出乎她的意料之外。
- What letter is a large body of water? 什么字母是一大片水域?
- A data viewer is a useful debugging tool. 数据查看器是个很有用的调试工具。
- The microscope is a useful auxiliary to human eye. 显微镜是肉眼的有用助手。
- Accompanying the letter is a parcel of books. 信外随带书籍一包。
- Shoemaking is a useful and necessary trade. 制鞋是一种有用的、必不可少的行业。
- The computer is a useful tool which we often depend upon. 计算机是我们经常依赖的有用的工具。
- A foreign language is a useful tool. 外语是有用的工具。
- Reading is a useful occupation to us. 阅读对我们是一种有益的消遣。
- A useful trade is a mine of gold. 一样有用的手艺是取之不尽的财富。
- This is a useful speech making sentence pattern. 这是个很有用的演讲句型。
- A useful exercise is a "minimal pair" exercise. 一个有用的锻炼是"最小一双"练习。
