TPO: T18L1 – Astronomy
That's because of their belief at the time that the heavenly bodies, the Sun,Moon,Stars and Planets, were perfect, without any flaws or blemishes.
12.high and low：到处
TPO: T5C1 – Student & Counselor at the University Counseling Center
And it so happened that the cellist graduated last year. They’ve been searching high and low for a replacement, someone with experience.
Paraphrase: disbelief or surprise
TPO:T26L3 – Astronomy
I mean, how come Halley’s is still there? After four and a half billion years. How could it be?
Paraphrase: to say nothing of…
TPO: T22L2 – Astronomy
we know the Sun’s current rate of mass loss, but if we assume that this rate has been steady over the last four billion years, the young Sun wouldn’t have been massive enough to have warmed Earth, let aloneMars, not enough to have caused liquid water.
15.off the hook：摆脱困境;脱身
Paraphrase: avoid sth.
TPO: T15C2 – Student & Biology Professor
And that's supposed to be a quiet environment? Not exactly. My brother and parents try to keep it down when I am studying, but the phone pretty much rings off the hook, so ...