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.
美元之所以又叫“绿背”（美钞），是因为美钞的背面是绿色的。
Dollars are called greenbacks because that is the color of the back side of the paper money.
在每张卡片上写一个单词，然后把把汉语或者英语释义写在背面。等你背完这些单词后，立刻复习一下，看你记住了多少。
Put one English word on each card, an then put either the translation or the English definition on the back. After you study the words, review them quickly to see how many words you remember.
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.
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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