1:4 和 4:1 的尺寸，同样适合用来生成各种特定物体的图片。
Some smoke alarms have been designed to be ultra-sensitive. Aspirating devices, for example, constantly suck in air in order to detect even small quantities of smoke in a room. They are often used in commercial settings, including server rooms packed with expensive computer tech.
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"At the River Itchen we have more than £70m worth of improvements to improve water quality as part of a wider plan for the River Test and Itchen, we will be announcing these in more detail later this year."