1 to understand

2 to comprehend

1 to understand

2 to know

3 to comprehend

1 eye

2 small hole

3 crux (of a matter)

4 classifier: 只 zhī

5 classifier: 双 shuāng

6 classifier for big hollow things (wells, stoves, pots etc)

1 tears

2 crying

3 classifier: 滴 dī

1 eye

2 classifier: 只 zhī

3 classifier: 双 shuāng

1 with one's face covered in tears (idiom)

1 lit. one strong beat and one weak beats in a measure of music (two beats in the bar) (idiom); fig. follow a prescribed pattern to the letter

2 scrupulous attention to detail

1 lit. one strong beat and three weak beats in a measure of music (four beats in the bar) (idiom); fig. scrupulous attention to detail

1 to see through something at first glance (idiom)

1 to feast one's eyes on (idiom)