when it comes to
当涉及某事（或做某事）时
When it comes to something or when it comes to doing something means when it is a question of something or doing something.
Here "to" is a preposition.
（注意：这里 "to" 是介词）
EXAMPLES
1. When it comes to getting things done, he's useless.
一涉及做事，他便不中用了。
2. Toddlers are notoriously antisocial when it comes to sharing toys.
众所周知，刚学会走路的孩子不愿和别人分享玩具。
Do a basic sit-up step
weighted sit-up
sit up
[sit ʌp]
坐起来;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.
她一坐起身来就感到天旋地转。
If you sit up, you do not go to bed although it is very late.
We sat up drinking and talking.
我们饮酒谈天，直至深夜。
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