Do a basic sit-up step
weighted sit-up
sit up
[sit ʌp]
坐起來;坐直；深夜未睡;熬夜
If you sit up, you move into a sitting position when you have been leaning back or lying down.
Her head spins dizzily as soon as she sits up.
她一坐起身來就感到天旋地轉。
If you sit up, you do not go to bed although it is very late.
We sat up drinking and talking.
我們飲酒談天，直至深夜。
(解釋，例句和圖片來自網絡）
grapefruit
[ˈgreɪpfru:t]
n.葡萄柚；西柚
A grapefruit is a large, round, yellow fruit, similar to an orange, that has a sharp, slightly bitter taste.
EXAMPLES1. An orange resembles a grapefruit.
橘子和葡萄柚很相似。
2. Citric acid can be extracted from the juice of oranges, lemons, limes or grapefruit.
檸檬酸可以從橙汁、檸檬汁、酸橙汁或者柚子汁中提取。
(解釋，例句和圖片來自網絡）
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