What CAN all that green stuff be?
那些绿色的东西是什么呢？
Stu tells us that no one should get too excited about the "green stuff" showing up on some of the rocks, as it certainly is not algae or moss or anything like that.
斯图认为，大家不必对部分岩石上的“绿色的玩意儿”太过乐观，很明显，那既不是海藻、苔藓，也不可能是其他任何类似事物。
Green stuff is in our back yard, and blue stuff is not.
绿色物质出现在我们的后院，而蓝色物质却没有。
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