是“极端”的意思
介词
1.（到） to; till; until
副词
1.（极; 最） extremely; most; utmost
介词
1.（到） to; till; until
from winter to summer
自冬至夏
fight on till one's last breath
战斗至死
up to the end of last month
截至上月底为止
副词
1.（极; 最） extremely; most; utmost
extremely cordial welcome; warmly welcome
欢迎之至
most important
至为重要
deeply moving; extremely moving
感人至深
That is our sincerest hope.
是为至盼.
See that you act accordingly.
至嘱.