橘子是可数名词。
tangerine:n.橘;橘黄色;橘红色;
例如:Review on tissue culture of tangerine
The Fertilization Experiments of Different Formula on Wenzhou Tangerine.
温州蜜柑配方施肥试验。
Studies on the Toxicity of Active Principle of the Extraction of Dried Tangerine Peel.
桔皮提取物有效成分的毒性研究。
Studies on Chemical Constituents of Processed Green Tangerine Peel.
炒青皮的黄酮类成分研究。