英语听力精选进阶版 13653（在线收听） |
Frankincense under threat, says study Vocabulary resin sticky substance that runs inside the trunk of trees drylands areas with a small amount of moisture struggling to sustain itself having difficulty in keeping alive monitored watched carefully to model the changing population to make a projection of the number of specimens in the future declining reducing livestock farm animals pushed out forced out of the area safeguard protect traded bought and sold |
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