单语范例（未经PONS编辑处理）
Again the best 50 plants were selected, this time based on yield per head, seed size, shortness, and free threshing ability.
en.wikipedia.org Seeds are 25 mm in length which includes the thin seed wings, surrounding the heavier central part of the seed.
en.wikipedia.org But the cost of the seed is very high.
en.wikipedia.org A tea can be made from the leaves and the roasted seed is used as a coffee substitute.
en.wikipedia.org The fulvous whistling duck feeds in wetlands by day or night on seeds and other parts of plants.
en.wikipedia.org