<s>Human: 给定一个英文文本和一个单词，检查该单词是否在文本中出现，并输出出现的次数。
文本: Natural language processing is a field of computer science, and it focuses on how to develop algorithms and technologies to enable computers to understand and generate human language.
单词: computer
</s><s>Assistant: 可以使用Python进行文本中单词的查找和计数。可以首先将文本分割成单词列表，然后使用.count()函数计数该单词的出现次数。下面是示例代码：

```python
text = "Natural language processing is a field of computer science, and it focuses on how to develop algorithms and technologies to enable computers to understand and generate human language."
word = "computer"
word_list = text.split() # 将文本分割成单词列表
count = word_list.count(word) # 计算该单词在列表中出现的次数
print("单词'{}'在文本中出现了{}次。".format(word, count))
```
输出结果为：
```
单词'computer'在文本中出现了1次。
```
</s>