当植物监测到那些有害物品时就会激发内信号，使叶子从绿色变成白色。
The plant detects the substance and activates an internal signal that causes it to lose its green colour, turning its leaves white.
带上足够喝的水、防晒用品、手电、救命药、白色床单或者颜色鲜艳的毛巾作为求救信号。
Ana Wisneski of the U.S. Coast Guard. Bring plenty of water to drink, sun protection, a flashlight, vital medications, and white sheets or colorful towels to signal rescuers.
电视白色空间频段上的信号传输稳定。所以这个频段非常适于无线移动设备的应用。
TV white space spectrum signals travel well, making it well suited for mobile wireless devices.
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