electricity, and send out impulses to trigger contraction.
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trigger contraction
触发收缩
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Theoretically the fall in prices should trigger a contraction of supply, as older ships are scrapped and new orders are cancelled.
理论上讲价格下跌应引发供应缩减，伴随着旧船的废弃和新订单被取消。
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