The system screens out suspicious transactions automatically and passes them to a human for review.
Tips
usage
What you do to a whole population to find the few cases hiding in it, every employee over forty, every transaction of the day. Examining one person who is already a patient is 检查.
memory
筛 is a bamboo sieve, so the word is literally sift-and-check: tip the whole batch through and look at what stays in the mesh. The same character gives 筛选, to filter a list down.
