The supplier confirmed that the replacement bulbs use a stronger tungsten filament this year.

供應商確認今年的替換燈泡採用更堅固的鎢絲燈絲。

Customer service explained that a broken filament is not covered under the standard warranty.

客服人員說明，燈絲斷裂不在標準保固範圍內。

During the factory tour, the manager showed how each filament is tested before shipping.

參觀工廠時，經理示範每條燈絲在出貨前如何接受檢測。