11.   Mayor Petra Roth had been standing on a slippery rock in high-heel shoes.

12.   They carried him out over the slippery rocks and rushed him to Centro Medico Hospital in San Juan.

a. + rock >>共 1111
alternative 2.86%
volcanic 2.47%
large 2.42%
solid 1.72%
classic 1.69%
big 1.55%
british 1.42%
red 1.30%
falling 1.22%
molten 1.17%
slippery 0.33%
slippery + n. >>共 219
road 8.88%
surface 8.67%
condition 5.50%
rock 2.54%
field 2.11%
floor 2.11%
pitch 1.90%
pavement 1.48%
highway 1.48%
footing 1.48%
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