concentrator
noun [ C ] uk/ˈkɒn.sən.treɪ.tər/ us/ˈkɑːn.sən.treɪ.t̬ɚ/
(DEVICE)
chemistry, medicine specialized浓缩器
a device for concentrating (= increasing the strength of) a substance by removing or reducing the amount of something such as water, or by collecting particular atoms or molecules together
She uses an oxygen concentrator to make it easier to breathe. 氧气浓缩器
physics specialized聚光反射镜（透镜）
a mirror or group of mirrors that focuses light from the sun (= directs its waves towards a particular point) so it can be used to produce power
The company will build at least 50 acres of solar concentrators behind the plant to generate solar power. 该公司将在工厂后面建造至少50英亩的太阳能聚光镜来发电。
internet & telecoms specialized（电脑或通讯网络中使用的）集中器
a device in a computer or telephone network that collects and combines information or signals from separate sources
The primary concentrators process and store information, received from some 40 meters. 主集中器处理和存储从大约40米处接收到的信息。
Each node (PC) attaches to a hub (or concentrator) via a cable. 每个节点（个人电脑）通过电缆连接到一个集线器（或集中器）上。
- More examples
- The hemo concentrator takes the whole blood and filters out liquids such as IV fluids, before returning it to the Hemobag in a concentrated form.
- The concentrator is a lightweight alternative to the bulky oxygen tank used by some people with lung disease.
- He invented a new optical concentrator with huge potential for the future of green energy.
- The concentrators are parabolic mirrors about three feet off the ground that move with the sun and focus energy on a tube filled with water.
- Pulse emitters send metered information to concentrators, which are connected to a Unix host.
(STUDENT)
education US specialized主修某专业的大学生
at some universities, someone who is studying a particular subject as their main subject
At Harvard in the late 1950s, philosophy concentrators were few. 1950年代末，哈佛大学主修哲学专业的学生很少。
You need a year of math if you're going to be a biology concentrator. 要成为生物专业的学生，需要学习一年的数学。
- More examples
- The number of students majoring in African and African American studies declined by half, from 42 concentrators two years ago to 22 last year.
- As an English concentrator you can pursue either the Honors Program or the Elective Program, which requires between 12 and 14 courses.