Encara no tenim significats per a "certain alertness".
1A certain alertness seemed to have deserted her usually piquant face.
2What he finally thought he caught in this most unusual tenderfoot was a certain alertness of a more or less hair-trigger variety.
3But a close observer would have seen, as Alfred did, that there was a certain alertness in that rigid and motionless figure.
4There was, moreover, a certain alertness in her expression rarely found in the feminine population of Millbourne, who were apt to be slightly bovine.
5Even the use of venom a second time possesses the disadvantage of a certain alertness against the very thing on the part of the victim.
6"Aha!" she commented, with a certain alertness of perception shining through the stolidity of her mien.
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