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64. stretch out: 伸直
On warm days, bears stretch out or lie on their backs with their feet in the air.
天气暖和的时候，熊会平躺下来，或四脚朝天仰卧着。
65. at the most: 最多，至多=at most/at the utmost
at best: 顶多，充其量（贬义）
Cherry blossoms last only for a few days, a week at the most.
樱花花期只持续几天，不超过一个星期。
66. get/be/stay/keep in touch with: 与……联系
反义：lose touch with; out of touch with
If I knew his address, I would get in touch with him right away.
如果我知道他的地址，我会马上和他联系。
67. act on: 影响，作用于；奉行，遵照……行动（=act upon）
Does the medicine act on the stomach?
这药对胃起作用吗？
work v.起效
a sleeping pill works for 8 hours 安眠药药效8个小时。
On warm days, bears stretch out or lie on their backs with their feet in the air.
天气暖和的时候，熊会平躺下来，或四脚朝天仰卧着。
65. at the most: 最多，至多=at most/at the utmost
at best: 顶多，充其量（贬义）
Cherry blossoms last only for a few days, a week at the most.
樱花花期只持续几天，不超过一个星期。
66. get/be/stay/keep in touch with: 与……联系
反义：lose touch with; out of touch with
If I knew his address, I would get in touch with him right away.
如果我知道他的地址，我会马上和他联系。
67. act on: 影响，作用于；奉行，遵照……行动（=act upon）
Does the medicine act on the stomach?
这药对胃起作用吗？
work v.起效
a sleeping pill works for 8 hours 安眠药药效8个小时。
