裁判因为球员犯规而亮出了黄牌。

The ___ref showed a yellow card for the player's foul.

请在论文中正确标注所有引用来源的参考文献。

Please properly label all the ___refs in your research paper.

这些蔬菜需要放入冷藏室保鲜。

These vegetables need to be kept in ___the fridge to stay fresh.