1 to screech

2 to shriek

1 to ascertain

2 to act on

3 to criticize

4 to pass on

5 classifier for batches, lots, military flights

6 tier (for the ranking of universities and colleges)

1 to criticize

2 criticism

3 classifier: 个 gè

1 to do sth in batches or groups

1 large quantities of

1 to get right to the heart of the matter (idiom)

1 sharply opposed to each other, with neither prepared to give an inch (idiom)

1 lit. to penetrate into a bull's horn (idiom); fig. to waste time on an insoluble or insignificant problem

2 to bash one's head against a brick wall

3 a wild goose chase

4 a blind alley

5 to split hairs