Some scientists have a hunch that a pregnant woman's diet and her exposure to various chemicals turn on some fetal genes and turn off others.(有些科学家有预感，认为孕妇的饮食和她接触的各种化学物质会开启一些胎儿基因，而关闭其他基因。)
Did you turn off the lights and check the locks on all the doors?(你关了灯，检查了所有门的锁了吗？)
How come people have to turn off their cell phones and all our electronic devices when an airplane is about to take off?(当飞机要起飞时，人们为什么要关掉他们的手机和所有的电子设备呢？)
Turn off IM and chat.(关掉即时通讯和聊天。)
The late musician Dennis Brian is said to have asked a fellow train passenger to turn off his radio.(据说，已故音乐家丹尼斯·布莱恩曾要求火车上的一名乘客关掉收音机。)
Would you turn off the TV, please?(请把电视关掉，好吗？)
She often forgot to turn off the gas and the food she was cooking usually got burnt.(她经常忘记关煤气，她做的饭经常烧糊了。)
Turn off the shower.(关掉淋浴。)
"Turn off the TV now!" she shouted.(“现在把电视关掉！”她喊道。)
We should never forget to turn off the lights when we leave the classrooms.(离开教室时，我们永远不要忘记关灯。)
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