You turn it on by either selecting that option from the Safety button at the upper right, or from the Tools menu in the Menu Bar if you have chosen to make that bar visible.
你可以在右上角的“安全”按钮里选择这个选项；如果你已经选择让菜单栏变成可见的，你也可以通过选择菜单栏中的“工具”菜单选定。
On the point of an upright needle he laid horizontally a fine steel bar, which could turn to the right and left like the magnetic needle in a compass-box..
他在一根垂直的针头顶点，设置了一根水平的钢制细棍，它可以左右转动，就像罗盘里的磁针那样。
Please go straight along the hallway, turn right at the end and the Bar is on the left.
请沿着走廊直走，到尽头右转，酒吧就在左方。
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