Test tube experiments suggest that humans paid a high cost for developing immunity to this bug: it may have left us much more susceptible to another retrovirus, HIV.
初步试验发现，我们对这种病毒的免疫力是以极大的代价换来的：为了抵抗它，人类对艾滋病病毒的抵抗力被大幅削弱。
Test tube experiments suggest that humans paid a high cost for developing immunity to this bug: it may have left us much more susceptible to another retrovirus, HIV.
初步试验发现，我们对这种病毒的免疫力是以极大的代价换来的：为了抵抗它，人类对艾滋病病毒的抵抗力被大幅削弱。
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