file thirteen 废纸篓

　　any container to discard or throw away unwanted paperwork; in an office setting a container for rubbish; the wastebasket

　　EXAMPLE:

　　"The salesperson crumpled the cancelled order and tossed it into file thirteen."

　　feel the pinch 感到手头拮据

　　a financially difficult, tight, strained, or squeezed circumstance or situation

　　EXAMPLE:

　　"Experiencing little demand for its products, the company began to feel the pinch."

　　feasibility test　可行性试验

　　a procedure or basis for evaluation or assessment to see if something is capable of being accomplished or brought about, or is possible

　　EXAMPLE:

　　"A business will often do a feasibility test on a product before spending money to market it to consumers."

　　door-to-door selling 挨门挨户推销

　　a method of presenting and selling products or services in which a salesperson goes to the residences or homes of potential buyers, knocking on their doors to solicit business

　　EXAMPLE:

　　"Many homeowners dislike door-to-door selling and consider it to be disturbing to their privacy."