人的手掌是微凹的。

The palm of one's hand is slightly concave.

《新英汉大辞典》

叶1片顶生于卵球形假鳞茎上，狭长圆形，长10-14厘米，宽1.8-2.3厘米，先端微凹，基部收窄成长约1.5厘米的柄。

Pseudobulbs ovate, 1-leaved at apex. Leaves narrowly oblong, 10-14 cm long and 1.8-2.3 cm wide, apex emarginate, base attenuate;

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熔合线凹入处的局部条件直接影响微裂纹的形成。

The formation of these microcracks is closely related to local conditions of the Tusion line concavities.

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