reactor
n
1 (also nuclear reactor) apparatus for the controlled production of nuclear energy 反应器; 反应堆.
2 substance taking part in or undergoing a chemical reaction 反应物; 反应剂.
It's much cheaper to camp than to stay in a hotel.
露营比住旅馆要便宜多了。
Sending a fax is more expensive than posting a letter, but much quicker.
发传真比寄信要贵些,但是要快得多。
Among the different types of bee, it is the honey bee that has most interested scientists because of the language they use to communicate with each other.