一

yī one; 1; single; a (article); as soon as; entire; whole; all; throughout; "one" radical in Chinese characters (Kangxi radical 1); also pr. [yao1] for greater clarity when spelling out numbers digit by digit

键

jiàn key (on a piano or computer keyboard); button (on a mouse or other device); chemical bond; linchpin

无

wú not to have; no; none; not; to lack; un-; -less

痕

hén scar; traces

打开

dǎ kāi to open; to show (a ticket); to turn on; to switch on

别人

bié ren other people; others; other person

bié rén other people; others; other person

摄像头

shè xiàng tóu webcam; surveillance camera

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