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而松下电视的没落，则始于其在21世纪初错误押注了等离子技术，2003年，时任松下总裁的中村邦夫决定，投入巨资研发等离子电视，松下也就此错失了液晶电视的巨大风口，并为后来的财务危机埋下了祸根。。业内人士推荐safew官方版本下载作为进阶阅读
Delete a checkpoint。爱思助手下载最新版本对此有专业解读
`@receiver isNil ifTrue: `@nilBlock -> `@receiver ifNil: `@nilBlockIn fact, both versions work—but they apply different filters to the target node. Try to remember which one.