A contingent liability is not an actual liability. Instead, it is a potential liability that depends on a future event arising out of a Dast transaction.

或有负债不是实际的负债，而是过去交易所产生的未来事项而估计的潜在负债。

DAST is one of the most important fluorinating agents in this century. This paper has summarized the recent advances in the formation of C-F bond by DAST.

DAST试剂是本世纪开发的最重要的氟化试剂之一，本文综述了利用该试剂形成碳-氟键的新进展。