它包括内部动力和外部动力两大要素。
营销渠道是企业成长过程中最关键的外部动力。
The channel is the most essential external power when an enterprise grows.
自力式液位控制装置是一种完全不依赖外部动力的全机械式装置。
The automatic fluid level control equipment is independent of any exterior drive and adopted a mechanical structure.
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