to chip away at a task and not abandon it (idiom); to chisel away at s
锲 · 14 strokes
Something engraved 契 in metal 钅; 契 also provides the pronunciation
而 · 6 strokes
Originally a pictograph of a beard, now written as 耏. The current use as a conjunction is a phonetic loan.
不 · 4 strokes
Pictograph of sepals of a flower. The modern meaning "no" is a phonetic loan.
舍 · 8 strokes
Phonosemantic compound. 口 represents the meaning and 余 represents the sound. 口 (mouth) indicates that the character is only "mouthed", i.e. only used for its phonetic value.
做学问需要锲而不舍的精神。
to chip away at a task and not abandon it (idiom); to chisel away at sth; to persevere; unflagging efforts