在我们咽下去之前我们会强迫自己仔细检查正在吃的东西，这很可能是我们的一种本能的反应。
This is probably an instinctive reaction to force you to carefully examine what you're going to eat before you swallow.
这句话的意思是这是说话者第一次吃寿司。在说这句话之前，说话者从来没有吃过。现在说话者正在吃寿司。 。
This means that it is the first time the speaker has eaten sushi. Until the present moment the speaker never ate sushi. NOW the speaker is eating sushi.
这句话的意思是这是说话者第一次吃寿司。在说这句话之前，说话者从来没有吃过。现在说话者正在吃寿司。 。
This means that it is the first time the speaker has eaten sushi. Until the present moment the speaker never ate sushi. NOW the speaker is eating sushi.
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