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話題：

Writing: imagine a scenario or express your opinion
Density
Density refers to how compact something is. What is the density? What thing does it relate to? Why is it important?
This week's topic: They calculated the density... (90-110 words)

Suggestions:
1) building a metal alloy with a certain density
2) the density of ice is less than the density of water
3) density changes as temperature changes
4) population density
5) Instead of writing a scenario, feel free to comment on the story below.

范例1：

The colour appeared to be different when seen from different perspectives. With the different pieces overlapping each other, there appeared to be some empty pockets throughout the sculpture. Perhaps the type of glass used had a high density, but still, from what Doug could see, with the empty spaces throughout the piece, especially with the core which seemed to be more or less hollow, the art piece should be lighter than how it felt in his hands. Doug lifted the sculpture higher and looked at the bottom; he found a compartment which was well-hidden.

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