ultraviolet screening agent

例句：

1. 1. This ultraviolet screening agent is used in the production of sunscreens.
   这种紫外线筛选剂用于生产防晒霜。
2. 2. The manufacturer claims that their product contains this ultraviolet screening agent to protectagainst UV rays.
   制造商声称他们的产品含有这种紫外线筛选剂，以保护免受紫外线伤害。
3. 3. The research team found that the ultraviolet screening agent in the sample could not effectively block UVB rays.
   研究小组发现样本中的紫外线筛选剂无法有效阻挡UVB射线。