如果您感觉到耳呜或听到的声音模糊不清，请摘下耳塞(或耳机)并检查一下您的听力。音量越大，听力就会越容易受到影响。听力专家建议您应该采取以下措施来保护听力：
1．限制使用耳塞或耳机以高音量收听的时间。
2．避免通过调高音量来隔离嘈杂的环境。
3．如果您听不到周围人说话的声音，请调低音量。
laser information
making adjustments or performing procedures other than those specified in your equipment's manual may result in hazardous radiation exposure.
do not attempt to disassemble the cabinet containing the laser. the laser beam used in this product is harmful to the eyes. the use of optical instruments, such as magnifying lenses, with this product increases the potential hazard to your eyes. for your safety,have this equipment serviced only by an apple-authorized service provider.
because of the optical disc drive in your computer, your computer is a class 1 laser product. the class 1 label, located in a user-accessible area, indicates that the drive meets minimum safety requirements. a service warning label is located in a service-accessible area. the labels on your product may differ slightly from the ones shown here.
高危险活动警告
本电脑系统不是为以下场合的操作而设计的：在核装置、飞机导航或通信系统，或者空中管制系统以及其他任何特殊场合，电脑系统的故障会导致死亡、人身伤害或严重的环境破坏。