observe, watch
当观察来讲时，observe相当于watch carefully，尤其用于实验或研究等场合。具体来说，observe含有察觉到的意思，watch意为盯着看。
watch 还含有观看(比赛、电视)等，而observe没有此意。另外，watch还有照料之意，相当于take care of。还有当心之意，相当于be careful with。
She has observed the stars all her life.
她一生都在观察星星。
Ill watch the baby while you are away.
你不在时，由我照料你女儿。
Youd better watch Mr Smith, I think he is a thief.
你最好当心史密斯先生，我想他是个贼。
