英语中没有量词，应该是冠词a
A watermelon is red inside and green outside.
西瓜内红外绿。Watermelon contains vitamins and also potassium.
西瓜含有维生素也有钾。
They planted some watermelon.
他们种了些西瓜。
Insects will soon smell watermelon.
昆虫很快会嗅到西瓜味。
I want to make the watermelon milk shake.
我要做西瓜奶昔。
The pulp of this watermelon is too spongy.
这西瓜瓤儿太肉了。
