One-trick pony

    黔驴技穷

    Pony是“小马”，one-trick pony是什么意思呢？请看对话：

    A: You are going to sell those stocks you've been investing for five years in the tech company. Why?

    B: My investment has brought good returns so far. But, the company has almost become like a one-trick pony. They are never able to develop the next big product.

    Note: A one-trick pony is a small horse that has one skill and one skill only. It is no good at anything else. This expression, American in origin, is said to have derived from shabby circus shows in rural America in the 19th century. You can imagine that circuses then did not have such a variety of glamorous shows as those on offer today. More likely, they had horses and dogs pulling carts and running circles, plus a few clowns bouncing around and little else. Hence, these shabby shows were known as one-trick pony shows.