例句與造句

1. There is a great deal of variation, however, to the extent in which the upper surface tissue of the rays crack : this tissue layer may also remain closely attached as a sheet over the unsegmented part of the outer wall with the part adhering to the rays variously cracked and sometimes finally peeling off in places.
2. It's difficult to find surface tissue in a sentence. 用surface tissue造句挺難的
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