20150809 【每日口說綀習】(collision)

Collisions are more likely if a material is dense,
or if it's made of elements with higher atomic numbers,
which means more electrons.


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collision
The collision between the ships was caused by fog.

material
The warm house and good food are material comforts.
Wood and stone are raw materials on the island.

dense = crowed / thick / compact / packed
Traffic slowed down because of dense fog.

atomic / atom

electron
electron tube
electron microscope