Stone-faced embankment slopes e joystick: o que têm em comum

1. Passo 1. Stone-faced embankment slopes — faz parte de — Levee. Slopes reinforced with stone or turf.
2. Passo 2. Levee — utiliza — Universal gravitation. The weight of the embankment holds back the water.
3. Passo 3. Universal gravitation — é utilizado em — Pin tumbler lock. The pins drop into holes in the bolt under their own weight.
4. Passo 4. Pin tumbler lock — faz parte de — Lock and key. The pins keep the cylinder from turning without a key.
5. Passo 5. Lock and key — tem como parte — Spring. Springs press the pins.
6. Passo 6. Spring — faz parte de — Joystick. They return the stick to the centre.

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