1. explore vi.勘查， 探测， 勘探
例句：It 's my pleasure to explore the possibility of trade with you .
我们很乐意与您探讨开展贸易可能性的问题。

2. indicate vt. 表明，标示，指示
例句：A survey of retired people has indicated that most are independent and enjoying life
对退休人员的调查表明，大部分人都自食其力，享受生活。

3. characteristic adj.特有的; 独特的; 表示特性的
例句：The characteristic I like best in him is his cheerfulness.
他的愉悦气质是我最喜欢的特点。

4. recognize vt.承认; 识别; 认出
例句：The receptionist recognized him at once
接待员一眼就认出他了。
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