Astronomers have been scouring the galaxy for decades for alien-produced radio signals — and more recently for non-naturally occurring light pulses, as well — to no avail.
几十年来，天文学家一直在探寻来自外星人发出的无线电信号，最近还在寻觅非自然发生的光脉冲，但却都一无所获。
The product is resistant to high-alkali, can be used for one bath scouring and bleaching process, the fabric whiteness after use a good, soft, equipment, non-silica scaling.
该产品耐高碱，可用于煮漂一浴工艺，使用后的织物白度好、手感柔软，设备无硅垢。
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