千种试探 could mean trying or testing something or someone in countless

Relation Nicknames

试探 [shì tàn]
Testing This implies a personality trait or habit of always wanting to test the limits or reactions ...
考验 [kăo yàn]
考验 means test or examination As a username it could indicate a personal belief in life being full ...
取试 [qŭ shì]
Literally meaning testing out it might imply exploration or experimentation with new endeavors ...