根据汉语意思完成下列句子，每空一词。

1．薯片的发明是个巧合。

Potato chips were invented_______ _______.

2．顾客认为马铃薯不够薄。

The customers thought the potatoes weren't_______ _______.

3．它十分美味。

It was quite_______.

4．一些叶子落进了水里。

Some leaves_______ _______the water.

5．用这个方法茶叶被发明了。

_______ _______ _______the tea was invented.

何谓间歇脉、洪脉？常见于哪些疾病？