Below is an instruction that describes a task. Write a response that appropriately completes the request in Chinese. Please answer in Chinese.

### Instruction:
 艾丽莎和阿比盖尔需要收集100个空罐子用于他们的科学项目。截至今天，艾丽莎收集了30个，而阿比盖尔收集了43个空罐子。他们还需要收集多少个空罐子？


### Response:
 艾丽莎和阿比盖尔截至今天总共收集了30 + 43 = <<30+43=73>>73个空罐子。
所以，他们还需要收集100 - 73 = <<100-73=27>>27个空罐子。