The workers carefully started uncrating the newly arrived equipment from the wooden crates.

uncrating 是动词 uncrate 的现在分词形式。uncrate 由前缀 un-（表示"去除、反向"）和 crate（"板条箱、木箱"）组成，字面意思是"从箱子里取出"，指"拆箱取出物品"的动作。