Pounding waves slowly chip away the bases of cliffs, forcing chunks of rock to crumble and slide into the sea.
海浪的冲击慢慢蚕食了悬崖的基础，促使岩石块倒塌而滑入大海。
2
So he keeps striking the rock. At some point it doesn't just chip, but literally splits in two.
所以他不断地砸着石头，到某个时候，它不是只被敲下些碎片，而是整个裂成了两半。
3
The rock drilling rate, service life and tungsten carbide toothavailability of the series of bits are obviously better than those of chip and button type bits.