大家好，想请问一下：
1.
pomelo noun
a large citrus fruit that has thick yellow skin and that tastes similar to a
grapefruit, but sweeter
上述的解释里的第二个that可以删去吗？成为：
a large citrus fruit that has thick yellow skin and tastes similar to a
grapefruit, but sweeter
原本里面的and是连接两个子句，那我是否可以换个角度思考，把那个and想成是连接
一个that子句中的两个动词就好，而删去第二个that？
2.then这个词蛮奇特的，辞典里只给副词、形容词的词性（也有辞典多给一个名词），
但实际上好像常当连接词用？例如：
朗文
Mix the flour and butter, then add the eggs.
Start off early, then you won’t have to rush.
牛津
He drank a glass of whisky, then another and then another.
剑桥
Let me finish this job, then we'll go.
Give her the letter to read, then she'll understand.
当然，“and then”这种正规的用法也很多，不过我好奇的是没加“and”的情况。
另查到苹果日报的专栏，作者认为这样写是错误的
http://hk.apple.nextmedia.com/supplement/columnist/art/20131211/18545133
请教各位看法，谢谢！