lean
(vi.)傾斜;倚,靠,依賴 She leaned too close to the rail to feed it a peanut(花生).
rail
n. 圍欄,扶手
zookeeper
動物園管理員
director
指導者;主任,董事,導演
voice
聲音
line up
排列一行
arrive
(vi.)到達;達成
explain
v.解釋,說明 The principal(校長) was very surprised also. But we explained it to him.
math
數學 history 歷史 geography 地理
in the middle of
在...當中, 在...的中途, 在...中央 So one day in the middle of a history lesson we all grabbed the hippo and turned it upside down.