hard rock的用法和样例：
例句
- "A sweet temper" is a figurative expression, but "sweet coffee" is not.
"甜蜜的性情"是个比喻的说法，而"甜咖啡"则不是。 - If the rock is homogeneous, the large size fragmentation can generally be attained more easily.
如果是均质岩石，一般可以比较容易地爆出大块料石。
词汇搭配
- between a rock and a hard place 左右为难; 进退两难...
- hard rock 硬石岩,硬岩,硬岩石...
- between the rock and hard place 左右为难
