tf 签名

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

上

shàng on top; upon; above; upper; previous; first (of multiple parts); to climb; to get onto; to go up; to attend (class or university)

shǎng see 上聲|上声[shang3 sheng1]

架

jià to support; frame; rack; framework; classifier for planes, large vehicles, radios etc

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]

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