bite、chew、gnaw与snap这些动词均含有“咬、啃”之意。
bite : 指用牙齿钳住或切断，或咬一口。
He bit into the apple.
他咬了一口苹果。
He bites his fingernails.
他咬指甲。
chew : 指用牙磨碎，或者为品尝味道而嚼。
This meat is difficult to chew.
这肉很难嚼。
You don't chew your food enough - that's why you get indigestion.
你没把食物嚼烂——这就是你消化不良的原因。
Would you like some gum to chew?
你想吃口香糖吗？
gnaw : 指连续不断用齿咬。
Babies like to gnaw hard objects when they're teething.
婴儿在长牙时喜欢啃咬硬物。
A dog lay under the table, gnawing on a bone.
一条狗趴在桌下啃骨头。
snap : 指突然猛咬。
The guard dog was snarling and snapping behind the fence.
那条看门狗正在篱笆后面吠咬。
The dogs snarled and snapped at our heels.
几条狗边叫边向着我们的脚后跟咬来。