例句與造句

1. Instead he permanently attached the knife blades to the rod, and adjusted the periods of the pendulum by a small movable weight " ( b, c ) " on the pendulum shaft . Since gravity only varies by a maximum of 0.5 % over the Earth, and in most locations much less than that, the weight only had to be adjusted slightly.
2. It's difficult to find pendulum shaft in a sentence. 用pendulum shaft造句挺難的