sniffer
/ˈsnɪfə(r)/noun
1
- a person who sniffs, especially one who sniffs a drug or toxic substance嗅者（尤指吸毒品或毒物）：
he gave a sniff which suggested that the sniffer had eaten better food.
他嗅了嗅, 那姿态显示嗅者品尝过更好的食物。
1.1
- informal a device for detecting an invisible and dangerous substance, such as gas or radiation〈非正式〉嗅探器：
electronic sniffers are used to detect the presence of a nuclear mass.
用电子嗅探器探测是否有核质量存在。
2
- informal a person's nose〈非正式〉鼻子。
3
- （亦作 sniffer program）a computer program that detects and records a variety of restricted information, especially the secret passwords needed to gain access to files or networks监视软件, 嗅探软件。