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。
2
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.