But engineers are hoping that their pretesting—using compressed air to fire a ping-pong ball down the pipe, Gillies says—will prevent such a mishap.
但工程师们希望他们的预测试——使用压缩空气将乒乓球注入管道——也许可以避免此类事故， Giilies 认为。
When marketers are creating fewer new ads and introducing fewer new products, it is doubly important to use rigorous pretesting to select the strongest alternatives.
随着新广告和新产品数量的减少，公司选出核心的主打产品无疑是必要的。
When marketers are creating fewer new ads and introducing fewer new products, it is doubly important to use rigorous pretesting to select the strongest alternatives.
随着新广告和新产品数量的减少，公司选出核心的主打产品无疑是必要的。
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