hard rock的用法和樣例：
例句
- "A sweet temper" is a figurative expression, but "sweet coffee" is not.
"甜蜜的性情"是個比喻的說法，而"甜咖啡"則不是。 - If the rock is homogeneous, the large size fragmentation can generally be attained more easily.
如果是均質岩石，一般可以比較容易地爆出大塊料石。
辭彙搭配
- between a rock and a hard place 左右為難; 進退兩難...
- hard rock 硬石岩,硬岩,硬岩石...
- between the rock and hard place 左右為難
