四种基本力(重力，电磁力，强作用力和弱作用力)都有一个理论把手，调节这东西可以改变力的强度。
Each of the four fundamental forces (gravity, electromagnetism, and the strong and weak nuclear forces) has a kind of theoretical knob that can be turned up or down to change its strength.
而此次研究观察的是断断续续的，但是不比正常睡眠时间短或强度弱的睡眠。
This study looked at sleep that was fragmented, but not shorter or less intense than normal for the mice.
越向左边拖动滑条，滤镜效果的强度就会越弱。
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