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强直-阵挛发，起僵硬、搐和意。

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.

通常是全身性强直-阵挛发，也就是躯干和四肢的肌肉突然变得僵硬，即强直期；然后痉挛，即阵挛期。