5. buttermilk n. residue from making better from sour milk
酪乳，将乳脂从牛奶或一次提制的奶油中除去之后的剩余物
eg: No one enjoyed buttermilk.没有人会喜欢喝乳酪。
6. picklen. vegetables(especially cucumbers) preserved in bring or vinegar 腌菜，泡菜
eg: Baoding produces excellent mixed pickles.
7. cronyn. a long-time close friend or companion 密友
eg: He and I were cronies at school.
8. sootyn. covered with or as if with soot 被煤烟覆盖的或似乎被煤烟覆盖的
eg: In the center of the house stands a sooty stove.
The boy began to smile at us, revealing two rows of white teeth under his sooty face.
9. unrollvt. ①reverse the winding or twisting of 解开
eg: Richards unrolled his quilt to make the bed.
②to unfold and present to view; reveal 揭示，使之能被人看到
eg: The captain unroll the map.