d for dog 狗狗
d for dog 狗狗
n:let prep n L2
d for dog 狗狗 .
 WORD_BOUNDARY  WORD_BOUNDARY  WORD_BOUNDARY  WORD_BOUNDARY
d WORD_BOUNDARY f o r WORD_BOUNDARY d o g WORD_BOUNDARY 狗 狗 WORD_BOUNDARY . WORD_BOUNDARY