其腹面口区具二环围口纤毛列；背面具一列背刚毛。
There are two circumoral ciliary rows on the buccal region and a dorsal row of bristles.
碲增加冷硬铸铁白口层厚度和硬度，缩小麻口区，但降低灰口部分的机械性能。
Te also raises the thickness and hardness of the chilled layer of white cast iron, reduces the area with mottle and lowers mechanical properties of the part of gray cast iron.
其腹面口区具二环围口纤毛列及一口前纤毛列；背面具一列背刚毛；腹面纤毛列的数目可发生较大变动。
There are two circumoral ciliarvrows and a preoral ciliary row on the buccal region and a dorsal row of bristles.
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