gel sub

例句：

1. 1.The gel sub was used to coat the surface of the sample.
   凝胶子体被用来涂覆样品的表面。
2. 2. The gel sub was used to create a smoother texture.
   凝胶子体被用来创造更平滑的质地。
3. 3.The gel sub was used to fill in the gaps in the fabric.
   凝胶子体被用来填充织物中的缝隙。