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A college acquaintance is afraid of train whistles .

一位大学熟人害怕火车汽笛。

In addition to packing lightweight plastic signal mirrors , well-designed whistles and flints that can be used one-handed , each kit contains a special type of tinder called wetfire .

除了装有轻巧的塑料信号镜、精心设计的哨子、可单手使用的打火石外，每个救生包中还有一个特种火源即所谓的wetfire。

That list , prominently displayed outside venues , also includes whistles , lighters and matches , drink , food in large amounts that can be easily thrown , balls , rackets , frisbees and balloons .

禁带物品名单张贴在场馆外的显著位置，名单中还包括哨子、打火机、火柴、饮料、容易被抛掷出的大块食物、球、球拍、飞盘和气球。

Incremental innovation focuses on making small improvements to existing products and services.it adds a few new bells and whistles , but does not significantly alter the product or the perceived value to the customer .

增值革新是对现有产品和服务做少量的改进，就像给产品增加个新的铃铛或哨子，对产品没有重大的改变，对顾客的服务没有增加明显的价值。