狗狗出门时必须佩戴挽具。
The dog must wear its ___harness when going outside.
马匹戴上了新的挽具准备拉车。
The horse was fitted with a new ___harness to pull the cart.
科学家们正在研究如何利用风能来发电。
Scientists are studying how to ___harness wind energy for power generation.
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