ICTRP一站式检索入口将“+”符号显示在检索结果中，从而发现同一试验的多个记录。
The ICTRP search Portal shows that it has found a group of records about the same trial by displaying a plus (+) sign in its search results.
一些试验表明，符号位水平迭加方法强调反射波的相干程度，因而在剖面上突出了弱反射波。
Some experiments show that the sign bit horizontal stack method emphasizes the coherence of reflections, thus weak reflections on the section are enhanced.
接下来的试验中，实验人员随即选出两个符号问他们哪个更大。
In a second test, participants were shown two symbols at random and asked to say which was the larger of the two.
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