单斜构造的层面大体平行有同一倾角,当层间的____不足时,岩层在外力作用下将会发生层间相对错动。
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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