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1.demonstrate v. 证明；证实；演示
例句：They are anxious to demonstrate to the voters that they have practical policies.
他们急于向选民证明自己有切实可行的政策。
2.vulnerable a. （地方）易受攻击的；易受伤的
例句：Plants that are growing vigorously are less likely to be vulnerable to disease.
生命力强的植物不容易得病。
