市面上雖然有自行車方向車燈的相關產品，但大多數產品使用效果不佳，使用車

市面上雖然有自行車方向車燈的相關產品，但大多數產品使用效果不佳，使用車燈的習慣難以普及 。

結果 (英文) 1:

Although there are products related to bicycle directional lights on the market, most of them are ineffective and the habit of using lights is difficult to spread.

結果 (英文) 2:

Although there are products related to bicycle directional lights on the market, most of them have poor performance and the habit of using lights is difficult to popularize.

結果 (英文) 3:

Although there are related products of bicycle direction lights on the market, most of them are not effective, so it is difficult to popularize the habit of using lights.