pit n. 〔美国〕(桃、杏等的)核。 vt. (-tt-) 除去…的核。 n. 1.坑,凹地,凹处;【矿物】矿井;煤坑;【植物;植物学】纹孔;地下温室,窖;(染)缸。 2.〔the pit 〕 地狱;深渊;〔方言〕坟墓。 3.陷阱;〔比喻〕圈套。 4.(剧场的)正厅后座〔英国指正面楼厅的下面〕;正厅后座的观众。 5.斗鸡场,斗狗场(等)。 6.身体的凹窝;心窝;胳肢窝。 7.麻子。 8.〔美国〕(粮食交易所的)现期交易部。 9.(汽车赛跑时的)加油站,车胎修理处。 10.〔美国〕棒球联赛的最低位。 11.【军事】散兵坑;靶壕;炮兵掩体。 the pit of the stomach (腹上部)心窝。 a etching pit 【冶金】侵蚀陷斑。 the bottomless pit =the pit of darkness=the pit of hell 地狱。 a wheat pit 〔美交易所〕现期小麦交易部。 at the pit's brink 快死。 dig a pit for 设法使…落在圈套里,陷害。 shoot [fly] the pit 1. (斗鸡等)飞出斗鸡场。 2. 不付房租潜逃。 vt. (-tt-) 1.〔常用 p.p.〕弄凹;挖坑;打矿井;使成麻子。 2.把(蔬菜等)放在地窖里;坑陷。 3.使相斗;抵抗。 a face pitted with smallpox 麻脸。 pit John against Paul 使约翰反对保罗。 vi. 成凹;成麻子。
It was shown that vessel elements in secondary xylem of p . emblica have many different forms and most of them have tails and their perforation plates divide into two types : ( 1 ) there is one simple perforation plate at each end of the vessel elements and ( 2 ) there is one simple perforation plate at one end of the vessel elements and two simple perforation plate at the other end ; ( 3 ) a few vessel elements have special inclusions ; ( 4 ) the intervascular pits are alternate pits ; ( 5 ) the pits between the vessels and rays are mixed pits , pits with transverse gashes and scalariform pits 结果发现,余甘子次生木质部导管分子中存在着许多不同的样式,导管分子大多数具尾;其穿孔板存在着两种类型: ( 1 )两端均为1个单穿孔板; ( 2 )一端为1个单穿孔板;另一端为2个单穿孔板; ( 3 )极少数的导管分子具有特殊的内含物; ( 4 )管间纹孔式为互列纹孔式; ( 5 )导管射线间纹孔式为混合型纹孔与横列刻痕状纹孔以及梯状穿孔。