单词：gastrointestinal tract
gastrointestinal tract的用法和样例：
例句
- This is how the GI tract keeps itself clean.这就是胃肠道能自我清洁的原理。
- The same contractions that cause your stomach to growl also clean out the GI tract.这些造成胃低鸣的收缩同时也清理了整个胃肠道。
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