An absence of heart tones by Doppler after 12 weeks is characteristic.
其特征是12周后多普勒未及胎心音。
Louder; it was almost as if an organ were accompanying it, and the tones came from the left hand, the side where the heart.
伴奏似的。这声音是从左边来的——从心所在的那一边来的。
"Don't try to second-guess Microsoft," he warned, in tones the professor has now taken to heart.
“不要试图揣测微软”，他警告说，语调中明显已经深信不疑。
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