spring

1.   пружина

2.   источник, родник

3.   нижняя часть (арки, свода)

- air spring

- bow spring

- buffer spring

- close-wound spring

- constant-force spring

- contact spring

- cussion spring

- damping spring

- door spring

- door hinge spring

- flat spring

- hard spring

- helical spring

- hillside spring

- latch spring

- retaining spring

- return spring

- stratum spring

- weightless spring