单词：block system
block system的用法和样例：
例句
- Every product that folds shall have a latch system that requires positive action on the part of the user to permit folding of the product.每个有可折叠机构的产品，均需有闭锁系统来确保折叠这个动作是有用户来操作的。
词汇搭配
- block system分区开采法
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