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話題：

Writing: imagine a scenario or express your opinion
Percent yield
Percent yield means the amount of actual product as a ratio to the theoretical amount of product. What is the percentage yield referring to? Is the percentage yield low or high?
This week's topic: They calculated the percentage yield... (90-110 words)

Suggestions:
1) calculating the percent yield in an experiment
2) maximizing the percent yield
3) percentage yield inconsistent
4) modifying the percentage yield
5) Instead of writing a scenario, feel free to comment on the story below.

范例1：

Although the overall yield might be lower, the percentage yield of the intended catch would be much greater. This trap setting method was thus more sustainable than sea floor scraping since the habitat was much less disturbed that way. It was important for people to be aware of the concept of sustainability. In terms of food choices people made, if everyone was more aware of how the food on their plates came to be, not only would it be more healthy for their bodies, the environment would be in a much better place as well.

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