Senses
虽则/ 雖則 although (initial clause)
used in the first clause to concede a fact that does not invalidate the main statement, often paired with 可是 or 但是
虽则/ 雖則 although (supplementary)
used in the second clause to provide a supplementary concession or qualification to the preceding statement
虽则/ 雖則 even if
even if; even though; granting that; often used for hypothetical or emphatic concession