这个发现对蜘蛛们可算是个好消息，因为如果蛛丝容易拧就容易摆动，这样十分不利于十字圆蛛捕食和避敌。
This is good news for spiders, since twisting can lead to swinging, not good when you're trying to sneak up on prey or avoid predators.
圆头一字槽螺钉的俯视图。选择框代表螺纹直径。
Top view of roundhead slotted screw. Selection box represents thread diameter.
把橘子用十字刀法切成圆片，再切薄一半，把红莴笋叶，橘片和红洋葱片都置于一个碗里。
Cut oranges crosswise into round slices, then cut slices in half. Toss red leaf lettuce, orange slices, and red onion slices in large bowl.
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