數血裡的細胞：數字，以及取得數字的檢查
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number of blood cells · noun
The number of cells in someone's blood, taken as a sign of how well their body is working.
血球數
Somebody counting what is in a drop of blood. The count is the number that comes out — how many cells are in there. The same two words then stretch to cover the whole visit that produces that number: the needle, the little tube, the lab, the report. So one phrase names both the reading and the checking that gives you the reading.
可以想成：有人在數一滴血裡面有多少東西。數出來的那個數字，就是 count。同樣這兩個字再往外一點，就把「為了得到這個數字所做的整件事」也蓋進去：抽血、送檢驗、等報告。所以一個詞可以指報告上的數值，也可以指那次檢查。句子裡的動詞通常會告訴你是哪一個：is low 是數字，have one 是檢查。
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