以致
yǐ​zhì HSK7

so that

yǐ​zhì so that
  1. 以 yǐ prepositionconjunction
    in order to
    in order to; so as to; used to connect two phrases where the second is the purpose of the first
  2. 致 zhì verb
    to cause
    To lead to, result in, or incur a specific outcome or condition.

yǐ​zhì down to
  1. 以 yǐ preposition
    [positional boundary]
    (bound form) used before words of location or time to indicate a boundary, such as 以后 yǐ​hòu or 以上 yǐ​shàng
  2. 致 zhì verb
    to deliver
    To send or transmit (a letter, telegram, or other objects)