weight dropper的用法和樣例：
例句
- The filament drive included a trailing weight and a preheater.
長(cháng)絲體的傳動(dòng)部分包括一個(gè)拖拉重錘和一個(gè)預熱器。 - Pendulum clocks showed the hours more exactly than earlier clocks, since the weight on the pendulum could be moved up or down to make the clock to go faster or slower.
擺鐘比早期的鐘記時(shí)準，因為擺上的重錘可以上下移動(dòng)調整鐘的快慢。
