Most febrile seizures are generalized tonic clonic seizures that cause stiffness, jerking and loss of consciousness.

大多数发热性惊厥为全身性-挛发作，可引起僵硬、搐和意识丧失。

They're usually generalized tonic-clonic seizures, which means that the muscles in the trunk and extremities suddenly become stiff, the tonic phase, and then jerk, the clonic phase.

全身性-挛发作，也就躯干和四肢的肌肉突然变得僵硬，即期；然后痉挛，即挛期。