discover, find, detect, ascertain
这些动词均有发现之意。
discover : 普通用词,指发现本来存在,但示被认识的事物、真理或情况。
Recently they have discovered a comet.
find : 普通用词,可指偶然发现,也可指经过寻找后得到或重新获得已失去的东西。强调动作的结果。
I have found the lost book.
detect : 正式用词,强调经过周密观察或研究而有所获得和发现,尤指发现有意隐藏之物。
The sensors can also detect the presence of nuclear, chemical or biological agents.
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