重点讲解：
1. except for 除了；除…之外；唯有；
The night was very quiet except for the ticking of the clock.
夜很静，只有钟摆滴答滴答地响。
2. turn into (使)变成；(使)成为；
Step one will be trying to get those undifferentiated cells to turn into something like muscle cells.
第一步将是试图让那些未分化的细胞变成类似肌肉的细胞。
3. cut off 切除；
Before proceeding any further, cut off a small bit of the meat and taste it.
在进行下一步之前，先切一小块肉尝尝。
4. as long as 只要；
He is up to the job without doubt as long as he would give his mind to it.
只要他专心，他一定能胜任这份工作。

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