掉

diào to fall; to drop; to lag behind; to lose; to go missing; to reduce; fall (in prices); to lose (value, weight etc); to wag; to swing; to turn; to change; to exchange; to swap; to show off; to shed (hair); (used after certain verbs to express completion, fulfillment, removal etc)

签

qiān inscribed bamboo stick (used in divination, gambling, drawing lots etc); small wood sliver; label; tag

qiān Japanese variant of 籤|签[qian1]

qiān to sign one's name; visa; variant of 籤|签[qian1]

检测

jiǎn cè to detect; to test; detection; sensing

常见

cháng jiàn commonly seen; common; to see sth frequently

稳定性

wěn dìng xìng stability

问题

wèn tí question; problem; issue; topic; CL:個|个[ge4]

电报

diàn bào telegram; cable; telegraph; CL:封[feng1],份[fen4]

@Yunyingpai 火箭

huǒ jiàn rocket; CL:枚[mei2]

苹果

píng guǒ apple; CL:個|个[ge4],顆|颗[ke1]

签名

qiān míng to sign (one's name with a pen etc); to autograph; signature

客服

kè fú customer service

hbf