英語時差:自制電話（上）
Kids these days have so many electronic toys it’s possible to grow up without ever discovering the best toy in the world — the tin can telephone. Moms and Dads, take note! Lots of science-types agree that kids will remember one toy you build with them years after they have forgotten the latest plastic gizmo. So, how do you make a tin can telephone? Take two metal cans and cut off one end on each. Be sure not to leave any sharp edges! If there are some, you can cover the rim with electrical tape. Make a small hole in the bottom of each can. Now take a long piece of string. Thread the string through the hole in each can, and tie a knot in each end so it can’t pull back through the hole. Now get two kids to hold the cans so that the string is taut. As one speaks into a can, the other listens in the other can. You’ll be surprised at how well this works.
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