稳定

wěn dìng steady; stable; stability; to stabilize; to pacify

tf 签名

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

免费

miǎn fèi free (of charge)

试用

shì yòng to try something out; on probation

电报

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

@ltesign TestFlight 内

nèi inside; inner; internal; within; interior

测

cè to survey; to measure; to conjecture

glq