Trace element
[化] 痕量元素
?? 牛津釋義
trace element
substance occurring or needed only in extremely small amounts (esp in the soil, for the proper growth of plants) 微量元素, 痕量元素（尤指土壤中的, 植物正常生長所需要的）.
?? 醫學釋義
微量元素
?? 詞語組成解析
trace
[tres]
vt. 跟蹤，追蹤;追溯，探索;探索;查找;
vi. 沿著一小徑或道路前進;可以追溯的;
n. 痕跡，蹤跡;微量，極少量;[植]（脈）跡;痕跡;
trace(draw)→回溯
element
['?l?m?nt]
n. [化]元素;要素;原理;[電]電阻絲;
??? 情景例句
How was your Thanksgiving dinner, Alexandra?
你們的感恩節晚餐怎么樣 Alexandra？
How much flour did you want to use?
你要用多少面粉？
The third item has been omitted.
第三項目漏掉了。