缺乏受过训练的人员。
而狗狗焦虑和压力大的迹象非常好辨认，至少对于受过训练的人员来说。
The signs of stress and anxiety in dogs are well established, and are easily observable, at least by trained individuals.
只有受过训练的急救人员才应该照顾被闪电击中的人。
Only trained emergency workers should care for a person who has been hit by lightning.
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