警察用防暴盾牌抵挡了抗议者扔来的石块。

The police used a ___shield to block the stones thrown by protesters.

这棵大树在炎热的夏天为我们提供了遮阳的屏障。

This big tree serves as a ___shield from the hot sun in summer.

电焊工人在工作时必须戴上防护面罩。

Welders must wear a protective ___shield while working.

他用雨伞为女友遮挡大雨。

He used an umbrella to ___shield his girlfriend from the heavy rain.