求翻译：Therefore, a program chair is usually hesitant in employing a speaker until he or she has had an opportunity to at least hear that speaker.是什么意思？

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悬赏分：1 - 离问题结束还有

Therefore, a program chair is usually hesitant in employing a speaker until he or she has had an opportunity to at least hear that speaker.

问题补充：

匿名	2013-05-23 12:21:38 因此，一个程序椅子通常是在用人扬声器，直到他或她有机会听到喇叭至少犹豫。

匿名	2013-05-23 12:23:18 因此,一个方案主席通常是不愿意雇用一个扬声器,直至他或她有一个机会,至少听到扬声器。

匿名	2013-05-23 12:24:58 所以，计划主席通常是犹豫的在雇用报告人，直到他或她有一个机会至少听见那位报告人。

匿名	2013-05-23 12:26:38 因此，program 椅子是聘请一位发言者，直到他或她已有至少听到那位演讲人机会通常犹豫不决。

匿名	2013-05-23 12:28:18 因此， - 程序椅子在雇用一位发言人方面是通常迟疑的直到他或她有了一次机会至少听到那位发言人。

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求翻译：Therefore, a ­program chair is usually hesitant in employing a speaker until he or she has had an opportunity to at least hear that speaker.是什么意思？