Topic
If you use the sun, you can find the correct geoduck. That's the topic of today's lecture.
Picture a teacher pointing to a chalkboard with a big pointer, and it says "TOPIC."
だい
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Our topic is actually mostly about using the sun to see different colored dyes (だい) in the water.
You use the dye in the correct sunlight to find the geoducks hiding under the sand. And once we master this topic, we'll move onto actually using dye to find them in the wild.