Definition: until and including this time Level: C1
到目前为止，政府尚未宣布新政策。
___As ___yet, the government has not announced a new policy.
科学家们至今仍无法解释这一奇怪的现象。
Scientists ___as ___yet have no explanation for the strange phenomenon.
关于预算问题，目前还没有明确的解决方案。
___As ___yet, there is no clear solution to the budget issue.
