1、 DDT prevented eagle eggshells from thickening.
DDT 会阻止鹰蛋壳变厚。
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2、 The doctors believe aspirin helps heart surgery patients because it can prevent blood from thickening and blood vessels from being blocked.
医生们认为，阿司匹林对心脏手术病人有利，因为它可以防止血液增稠和血管堵塞。
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