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) are all a lot more timid as opposed to black mamba and have not been reported to assault human beings. Such as the black mamba, they can flatten their necks into a narrow hood to be a defensive posture.而不一定非得是每天在实验室扎根于科研的人 才有资格去追踪前沿技术发展，还有一大帮可能是出于对前沿技