bicycle seat

1. A rack ( as behind a bicycle seat) for luggage.
   用来放行李的架子（如自行车座子的后面的架子）。
2. Because the bicycle body and the seat gravity center are largely reduced, the use is extremely convenient and safe.
   因为车身及座位重心大幅度降低，使用时及为方便、安全。
3. When people speak of bicycle frame sizes, they generally speak in terms of the seat tube length.
   人们谈到车架尺寸时，通常是按照立管尺寸来计算的。

noun

1. a seat for the rider of a bicycle

   Synonym:    saddle