The insects release an anticoagulant to get blood flowing, and they also excrete a numbing agent so their bites don't often stir a victim's slumber.
这些昆虫会释放出一种抗凝血剂去维持血液的流动，同时也会分泌一种使人失去知觉的物质，所以他们的叮咬并不会影响受害者的睡眠。
The control group (36 cases, 42 eyes) was treated by vasodilator, anticoagulant, hypoten-sor, lipid - lowering agent and iodine preparation;
对照组36例（42眼），选用血管扩张剂、抗凝剂、降血压、降血脂及碘剂等治疗；
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