The plant detects the substance and activates an internal signal that causes it to lose its green colour, turning its leaves white.
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。
2
Yellow is a traditional tie colour in countries, including England, which can signal assuredness, along with radiance and vitality, he said.
他说，在很多国家，包括在英国，黄色是传统的领带色。它给人一种自信、活力的跃动感。
3
The principle and method for calibrating the frequency by means of colour subcarrier signal of broadcast TV are introduced in detail, and the corresponding measurement accuracy is given in this paper.