為數眾多(或不多);數目巨大(或微小);眾多(或稀少)
thick / thin on the ground
為數眾多(或不多);數目巨大(或微小);眾多(或稀少)
if people or things are thick / thin on the ground, there are a lot / not many of them in a place
Customers are thin on the ground at this time of year.一年裡這個時節顧客很少。
釋義來自《牛津高階英漢雙解詞典》第 9 版