难以捉摸的（形容词）

（adj） be difficult to detect or grasp by the mind

EXAMPLE: Despite all the goodwill in the world, the Middle East peace process remains as elusive and frustrating as ever.

尽管全世界都对其给予厚望，中东和平进程还是像以往那样难以捉摸、令人沮丧。

洗钱

he process of concealing the source of money obtained by illicit means

EXAMPLE: Each country is active in being against the money laundering crimes in the world, and advocates enlarging the scope of the laws relating to money laundering.

世界各国都在积极致力于反洗钱活动，并提倡扩大洗钱上游犯罪的范围。